Osomatsu-Kun- A Comedy Manga by Fujio Akatsuka which ran from 1962 to 1969 which followed a group of sextuplet (a multiple birth of six children) brothers. It was later adapted into two anime, one by Studio Zero in 1966 and another by Studio Pierrot in 1988 as well as spin-off by Studio Pierrot in 2015 titled “Osomatsu-San” which follows the sextuplets in their 20-somethings as NEETS.
Fourth-Wall Breaks- Osomatsu-San has multiple moments where the characters will break the fourth wall, such as in the first episode where the characters try to be a “proper anime”, or worship Fujio Akatsuka like a god.
Visual Distinguishers- The Matsuno Brothers have multiple visual distinguishers so the audience can more easily tell the brothers apart. Examples include: Signature Color, Hairstyles, and Facial Expressions. The brothers were given different colors supposedly because the character designer couldn’t tell the difference between them.
Parodies + References- The anime makes dozens of parodies and references to other anime/popular media such as Attack on Titan, Saw, Demon Slayer, Naruto, and Sailor Moon. The anime’s extreme popularity in Japan also led to other anime to parody and reference Osomatsu-San including The Disastrous Life of Saiki K, Love Rice, and JoJo’s Bizarre Adventure. Osomatsu-San has too many references to other anime and there’s too many references to Osomatsu-San from other media, so I just included it as one entry.
NEET- A common acronym in Japan which stands for Not in Education, Employment, or Training, but also includes anyone who is not engaged in housework, unemployed, not seeking work, and not in any school or work-related training.
F6- The F6 are the idealized version of the Matsuno brothers that parody pretty-boy anime. The “F” in F6 stands for Fujio, as in Fujio Akatsuka, the creator of the original manga. In the first episode, their first appearance, Ichimatsu transforms into a hybrid stylization of the 2015 anime and the 1966 anime, but in the season finale they are seen alongside the Matsuno brothers, implying they are separate characters.
___Matsu Boys and Girls- The fan term for each of the six brothers, based on Karamatsu’s line calling his fans his “Karamatsu girls and boys”.
Banned 1st Episode- The 1st episode of the anime was banned in Japan due to copyright law, as Japan has no clause for parody and has a more strict interpretation of fair use. It was never confirmed which company filed a copyright infringement against Osomatsu-San, but there is a theory that the Attack on Titan parody was the main culprit. The episode has still not been released on physical media and all streaming services do not carry the first episode, instead beginning the series on the second episode.
The Osomatsu-San Movie- Released on March 15th 2019, the movie follows the brothers traveling back in time to meet their high school selves and to resolve one of the brothers’ biggest regrets.
Collab Ad Campaigns- Osomatsu-San has collaborated with dozens of other brands on merchandise/advertisement campaigns. Many of these collaborations have created special events and merchandise for Osomatsu-San. Examples include: Ministop, Sweets Paradise, Dohtonbori Okonomiyaki, and Sanrio.
Akatsuka’s 80th- Osomatsu-San was created in honor of Fujio Akatsuka’s 80th Birthday and death, having died at 72 in 2008.
Todomatsu Face Meme- In the episode “Todomatsu and the 5 Demons” Todomatsu makes a face at his brothers for talking to the Sutabaa baristas, which has become a meme that has even spread outside the Osomatsu-San fandom.
Tier 2-
Homura-Chan is a Porn Actress- Although nothing is stated outright, it is heavily implied in her first episode appearance that she is a porn actress as Osomatsu finds a porn movie and seems surprised by the cover before going on to have a conversation with Jyushimatsu which Jyushi ultimately avoids.
Karamatsu Wears Contacts- A fun fact that few in the fandom seem to remember is that Karamatsu wears contact lenses. Although he (and all the Matsuno Brothers) have brown eyes, he wears brown contacts, but the presumed reason he wears contacts is because circle contacts (mainly worn by cosplayers and Japanese teen girls) make eyes look bigger and cuter- which is why Osomatsu insults him for wearing them.
Episode 3.5- Also titled “Episode 3.5: Virgin Heroes”, an episode was created to be put on home media releases to replace the 1st episode due to the ban. It is chronologically after Episode 3 but before Episode 4 and has two segments. The first segment features the F6 in a parody commercial, with the second focusing on Choromatsu seeing a group of college kids having a barbecue and being visited by the Cherry Boys (the other five Matsuno brothers in Power-Ranger parody outfits)
BLMatsu- A fandom term for incest ships involving the Matsuno brothers romantically or sexually. BL stands for Boys Love, which is a popular anime and manga term for gay male pairings typically aimed at women. Common ships include OsoChoro and KaraIchi.
Broken Heart Tongue- A small detail in the series is that whenever Jyushimatsu is depicted smiling, his tongue is in the shape of a heart, but in the episode “Jyushimatsu’s Girlfriend” when Jyushimatsu is crying at Chibita’s Oden stand, his tongue is a broken heart.
Matsus Unknown Age- The brothers’ age has never been specified in the Osomatsu-San anime. They are said to “not be older than 24 or 25” and that their parents have been married 24 years and they were born soon after, so they have been assumed to be around 24 but it has never been confirmed.
Girlymatsus not Related- A common misconception in the fandom is that the Girlymatsus are sisters, or the earlier fan theory in Season 1 that they are the Matsuno brothers in drag- but the Girlymatsus were later confirmed just to be friends.
An Anecdote With Horses- An exclusive episode made in collaboration with the Japan Racing Association (JRA) which aired on December 16th, 2016 which featured skits of the Matsuno brothers racing horses.
English Dub Production Issues- After Viz Media acquired the rights to Osomatsu-San, it came out in September 2020 that the English Dub of Osomatsu-San was delayed to be reworked as well as having to replace Christopher Niosi (Choromatsu’s original VA) with Sean Chiplock, due to abuse allegations which Christopher later confessed to.
4th ED is the only ED without stop-motion- While the majority of the Osomatsu-San ending themes feature stop-motion using a variety of items such as toys, clothing, and food; the 4th ending (the second ending of the second season) uses slow-motion footage of paint being dumped onto busts of the Matsuno brothers.
Pine Tree- The kanji for “Matsu” translates to Pine Tree, which is why the pine tree symbol is so frequent in the show’s iconography, such as in the title and on the brothers’ sweaters.
The Hipipo Tribe and The Glistening Fruit- The first of two movies released to celebrate the sixth anniversary of the anime, which features the brothers journeying to find a fruit which grants wishes before encountering the Hipipo Tribe.
Hatabou’s Meat- In the episode “Tell Us, Hatabou”, Hatabou sells meat out of a variety of vendors, but when the brothers ask what kind of meat it is he refuses to answer. Earlier in the episode his employees try to boot him from the company, which leads to his new business venture, implying that the meat is of his former employees though it is never stated outright within the show.
The Soul’s Takoyaki Party and The Legendary Sleepover Party- The second of the two movies released to celebrate the sixth anniversary of the anime, which features the brothers hosting a takoyaki (grilled dough balls with octopus inside with a variety of toppings) party which turns into a sleepover.
Hair Color Change- In the original series Osomatsu-Kun, both the 60s and 80s, the brothers had brown hair but in Osomatsu-San they are depicted with black hair.
Tier 3-
May 24th- The Birthday of the Matsuno Brothers.
Fandubs- Due to the long development time and many delays of the official English Dub, there are multiple fandom dubs of the anime.
Fan Vocaloids- The Osomatsu-San fandom has many popular fan vocaloid covers, some of the most well-known including Matryoshka, Normie Eradication Committee, Rolling Girl, and LOVE 1000%.
Hesokuri Wars/Tabimatsu- Also known as “Osomatsu-San Hesokuri Wars -Battle of the NEETS-“ is tower-defense style strategy mobile game that was released in Japan in 2016 and later being released in English in 2017, before being shut down on October 2nd of 2022 to make way for Tabimatsu. Players would choose a team of 10 characters to fight through stages, with dozens of exclusive events and character variations being released. Many popular AUs in the fandom were inspired by sets released for Hesokuri Wars.
Each Brother’s Name Meaning- Osomatsu translates to lame, or Osoi which means slow- referring to him being the most “basic” of the brothers and lazy. Kara can mean emptiness, referring to his narcissism and chasing his brothers’ approval. Choroi translates to simple, referring to his more average personality. Ichimatsumuyo means checkered pattern (along the lines of a Go board). Jyushimatsu translates to society finch, which are known to be kind like Jyushi. Todomatsu meaning Manchurian fir or “finally”, as “finally” was his catchphrase in the original 60s anime.
Jyushimatsu’s Catchphrase Change- In the first season Jyushimatsu’s main catchphrase was “Muscle Muscle, Hustle Hustle” but in season two and onwards, it was changed more to “Booeh.” There wasn’t any explanation given by the show staff as to why it was changed.
Letter’s Contents- The entire letter Choromatsu had written in “Letter” was never revealed, with only one or two lines spoken by Choromatsu at the beginning of the skit describing what he’d written before later modifying it, leading fans to speculate exactly what was written.
Brothers are pure evil- At the end of the episode “Godmatsu”, in order to defeat Godmatsu the brothers combine their darkness to create Akamatsu. Once Godmatsu is defeated, they absorb only Akamatsu back into themselves, therefore only being made of their evil self. This possibly explains their more violent nature after this point in the series.
AOP Breakup- AOP is an idol group that formed in 2012 under the agency Nikkei Entertainment. The group created multiple songs for the anime, including the theme songs “Zenryoku Batankyu wa Yoiko Dake”, “Hanamaru Pippi wa Yoiko Dake”, “Maboroshi Wink”, and “nice to NEET You!” On December 14th, 2020 the band stated they would be ceasing activities before disbanding in 2021.
Sakurai Drama- Takahiro Sakurai is the original VA for Osomatsu who admitted in 2022 to having cheated on his wife for 10 years, planning to eventually marry his affair partner. Due to this scandal, Osomatsu-San content has been delayed for the past two years.
Religionmatsu- A popular AU which depicts the Matsu brothers as gods, devils, angels, and clergymen. One of the few AUs which was created by the fandom and not inspired by a Hesokuri Wars set.
Sickfics- A fanfiction genre in which one character cares for another who is sick. These fanfics are particularly popular in the Osomatsu-San fandom because of the episode “We Caught a Cold” in which all of the brothers catch a cold and each have a moment to care for the others.
Matsuno Family Dependents- A “wallpaper simulator” type mobile game where the player collects variants of the Matsu brothers and raises them.
Dekapanman- A Parody of Anpanman in which Dekapan dresses up as a hero that gives items from pants to children which was significantly censored due to the controversy and copyright infringement caused by the parody.
Shueisha Manga- Beginning in 2016, a manga series was released alongside the anime. Published by Shueisha in the magazine You from 2016 to 2018 then Cookie from 2018 to 2020 with 10 volumes of stories not featured in the anime.
Only Child Theory- Theory that states that Osomatsu is an Only child with a personality disorder that causes him to develop different personalities that are “his brothers”. As the first known sextuplets to have been born and all survive were born in 1974, many years after the original 60s anime aired. The skit “Sanematsu” is often used as proof for this theory.
Tier 4-
Stage Shows- “Osomatsu-San on Stage: SIX MEN’S SHOW TIME” is a musical adaptation of the original anime, with three seasons matching the anime and having been released on home media.
Episode 10 Controversy- There are some reports of Episode 10 causing controversy upon release for having characters transition to women for personal gain. (Though I will admit, in my research I could not find any comments/posts accusing the show of being transphobic. The only slight criticism I could find was of the ending being too harsh towards Chibita and Iyami’s actions and the episode’s pacing being too slow. I am not claiming that the controversy does or does not exist, or that the episode is or isn’t offensive, I just could not find any evidence in my research of people taking offense to it.)
More Than 6 Brothers- Theory that there are more than 6 brothers as in some scenes in the anime and some promotional material it appears that there’s more than 6 brothers. Though there are episodes in the anime in which another brother is accepted into the group or created such as Godmatsu or Akamatsu.
Where is Orange Matsu?- The brothers all fit the primary (Red- Osomatsu, Yellow- Jyushimatsu, Blue- Karamatsu) and secondary (Green- Choromatsu, Purple- Ichimatsu) colors with the exception of orange as Todomatsu’s main color is pink. This has led some to theorize that there is a secret orange brother. The show creators stated that they made Todomatsu’s color pink to make his style more feminine and youthful, as well as to show that he’s intentionally trying to not fit in with his brothers by not following the same pattern.
Pazzmatsu- AKA Puzzlematsu is a match-3-tiles puzzle mobile game released in Japan in 2016 which continued until April 2018 when it was rebooted as “New Pazzmatsu”.
Doramatsu- A series of audio drama CDs that include unique stories that did not appear in the anime.
Matsus Stay Dead After S2- In the finale of Season 2, the brothers die from a plane crash and are sent to hell for their numerous misdeeds. This theory posits that the brothers stayed dead after the end of season two and that season three is their personal hell. This is a joke theory to explain season three’s shift in focus.
Osomatsu-San the Live-Action Movie- A Live-Action movie with a unique story based on Osomatsu-San with members of the J-Pop group Snow Man playing the Matsu brothers.
Brothers can’t be told apart in 1st promo- In the first promotional image released for the anime, the brothers’ personalities and visual distinguishers hadn’t been ironed out yet so long-time fans of the series noticed that it’s near impossible to distinguish which brother is which in the image. The only brother that is able to be identified is the center brother holding Karamatsu’s signature glasses.
Osomatsu-Kun Grows Up- Technically Osomatsu-San is an alternate universe to the original Osomatsu-Kun series canon, as in 1993 a beer ad was published showing what the Matsu brothers became when they reached adulthood. Osomatsu becomes a salaryman, Karamatsu marries a grocer’s daughter and helps with the family business, Choromatsu becomes a policeman, Ichimatsu marries and becomes a CEO, Jyushimatsu becomes a doctor, and Todomatsu works in a fish market.
Light Novels- Osomatsu-San has spawned a handful of Light Novels and short stories with plots not included in the anime. Examples include: Osomatsu-San the Beforematsu and Aftermatsu, VS Kochikame, and Shut Up Osomatsu.
April Fools- To celebrate April Fools, Osomatsu-San has released multiple fake announcements and fake Tabimatsu sets. This includes the 2015 announcement that the series would be releasing a new Osomatsu-Kun project, the 2017 announcement that a live-action adaptation starring the Byplayers would replace the anime, and the 2019 Tabimatsu set with a Irasutoya art style.
Yamano to Matsuno- The last name of the family was originally Yamano but was changed to Matsuno last minute as Yamano was considered a more “generic” last name.
Tier 5-
Date or Work- Also known as “Osomatsu-San the Game” is an adventure game released in Japan in 2017 for the PSVita. The story has you play as a heroine who gets calls and texts from the brothers asking for advice on their quest to get a job.
Karamatsu is Bisexual- In the first Osomatsu-San movie Karamatsu says “Sorry to keep you waiting, Karamatsu girls and boys!” Also in a drama CD Karamatsu reads off a love poem that he wrote to a male convenience store worker named Kumada Youji. It’s still debated whether the drama CD is canon to the anime and if the line in the movie was just referring to his fans in a non-romantic or sexual sense.
Recycled Scripts- Some of the episodes such as “Iyami, Alone in the Wind”, “ESP Kitty”, and ”The Life of Chibita’s Flower” were based off of chapters of Osomatsu-Kun modified to fit the series. Some skits from Season 3 were also based off of Doramatsu tracks.
Do Matsu’s Smoke?- A topic of debate in the Western fandom, Karamatsu is shown to smoke in multiple episodes and Osomatsu has been shown to be surrounded by cigarette boxes previously but it hasn’t been stated whether the other four brothers smoke.
Brothers had freckles- In the original Akatsuka designs for the brothers, they were designed to have freckles on their cheeks as well as other different facial features. These were changed to make the faces look more cute and easier to draw.
Ichi’s Personality given to Todomatsu- Ichimatsu’s Personality was going to be more snarky and rude than his current more doom and gloom. His characterization was instead given to Todomatsu by Miyu Irino’s suggestion, thinking that the youngest brother being catty would be funnier.
Life-Sized Statues- For the 2016 Summer Wonder Festival, the company Figurex 3D printed life-size statues of the six brothers, with smaller versions of the figures being sold at the event as well. While some have reappeared at Osomatsu-San events, such as the Ichimatsu figure, some have not been seen since their original showcase; this has led fans to search for the statues current locations. There is a link to buy one of the statues from one of the Japanese websites that first reported the event, but the link is now dead and leads to an error page.
Osomatsu-Kun Video Game- AKA “Osomatsu-Kun: Nonsense Theater” is a platforming video game released for the Sega Mega Drive in 1988 based on the original Osomatsu-Kun manga to promote the upcoming anime. The game only had a total of three levels with confusing level design and bad controls that caused it to gain an infamous reputation. It has recently gained a cult following as a kusoge (a Japanese video game that is celebrated for its awful quality.)
Cheaper by the Dozen- The manga was originally loosely based on the TV Show “Cheaper By the Dozen” (an American film from 1950 about a couple and their 12 children) with there being 12 children, but Akatsuka found it too hard to fit 12 characters in a single panel so he decided to cut the amount in half. Eventually changing it to be identical sextuplet brothers.
Denki Mystery- A popular AU that started as a Hesokuri Wars set. As opposed to other Hesokuri Wars sets, Denki Mystery had an entire storyline based on mystery novels, David Lynch films, and Japanese horror.
Iyami + Dekapan Made By Akatsuka’s Assistant- Both the characters Iyami and Dekapan were created by Fujio Akatsuka’s Assistant and later added to the manga.
Rice balls are Govt plants/Destroy NEETS Theory- Theory that the Riceballs were created by the government to reform NEETs to be functioning members of society.
Tier 6-
Six Same Faces #3 Song in Japan- On the week of December 28th, 2015 the song SIX SAME FACES ～今夜は最高!!!!!!~ (the first ending song of the first season) reached #3 on the Billboard Hot 100 in Japan, following the album’s release on December 16th, 2015.
Clone Theory- Theory that states that the brothers were cloned from Osomatsu. (I will admit I cannot find my previous evidence of this theory, if anyone does have proof of someone creating this theory or evidence for the theory please let me know.)
Sheeh Was a Real Trend- Iyami’s catchphrase/punchline used to be a cultural meme when Osomatsu-Kun was big in Japan. Famous figures to imitate Iyami include Godzilla and John Lenon from The Beatles.
VR Game- A virtual reality game collab that ran in Anime Plaza Machida and Adore’s Sunshine Store from 2017 to 2018 in which the player would hang out with the Matsu brothers in the bathhouse. It was later released theatrically as “Movies in VR!” in 2018 with “Evangelion: Another Impact”.
Fesmatsu- To celebrate each season’s release, a festival was thrown which would feature live action skits performed by the voice cast.
Todo is the hardest to animate- According to some of the animators who worked on the first season of the anime, Todomatsu was the hardest to animate of the six brothers because of his more feminine and youthful mannerisms.
Pachinko Games- Pachinko (an arcade gambling game) Games made in collaboration with Osomatsu-San, typically reusing animation from the anime though some have original animation exclusive to particular pachinko games. Examples include: Pachislot: Osomatsu-San, Pachislot: Osomatsu-San ~The Surprise~, & CR Osomatsu-San THE Drum.
Korean Dub Censorship- Due to South Korea’s strict censorship laws, Osomatsu-San was heavily censored by completely removing shots or scenes that featured characters being nude or wearing swimsuits. Some of the ridiculous censoring goes to the point where if a character is wearing a bikini, the entire screen will be cropped to only show their chin and up. Any scenes including nudity, swearing, violence, and sexual references were cut from airing or censored to hell and back (which to be fair is 99% of Osomatsu-San.)
Browser Games- Games that were available through Yahoo, some which were ported to AU SmartPass in the Osomatsu-San NEET Collection. Some examples include: Quiz Battle, Pleasing Totoko-Chan, & Osomatsu-SAN’s Black Factory.
Love Letter Board Game- A board game which players play as the brothers trying to woo Totoko-Chan.
*Matsuno Official Sex Toys- In collaboration with Kanojo Toys, a Japanese adult toy manufacturer, two dildos replicating Ichimatsu’s and Jyushimatsu’s canon lengths were released. The items were meant to be gag gifts but sold better than expected. The official website mocking Jyushimatsu’s girth and Ichimatsu’s length. “Hand massagers” of the other four brothers were also released. I hope y’all like this iceberg because now I’m being aggressively marketed at Japanese sex toys for researching everything on here.
S3E10 Aired on Crunchyroll before Japan- The tenth episode of the third season of the anime was delayed from airing as the channel was broadcasting the TV Tokyo Live 2020 U.S. Women’s Open which had previously been delayed due to rain. Though due to an error, the episode was released on time on streaming platforms early.
Tier 7-
Dmatsu-San- An internet series animated with Flash that aired on NTT DoComo to tie in with season 2 of the anime. The series includes 12 episodes, each at a minute’s length. Each episode features one of the sextuplets interacting with either Totoko or Iyami.
# of Dayons- In the episode “Let’s Get a Job” the brothers work in a factory that is revealed to be creating Dayons or clones of Dayon- as well as in the episode “Dayon Tribe” it’s shown that there’s an entire society living within Dayon’s stomach. This has led fans to question how many Dayons there are in the world of the anime, or if every appearance of Dayon is a different Dayon.
Sheeh-Wave- An internet radio series with the VA for Iyami interviewing other voice actors in character as Iyami. Having two seasons with the first airing from 2015 to 2016 and the second airing from 2017 to 2018 broadcast on Animate.TV.
*PASH Reveals Matsunos fetishes- In a magazine interview with the VAs for the Matsu brothers, each of their VAs had to guess their character’s fetish. Osomatsu- Boobs, Karamatsu- “As long as there’s love”, Choromatsu- “I won’t say” or humiliation as said in a Drama CD, Ichimatsu- Paw pads, Jyushimatsu- “Eh?”, Todomatsu- legs and bellybutton wrinkles.
2 Withheld Skits- 2 skits that were removed after the Dekapanman apology. Presumably parodies of other Japanese children’s media, but no information about what they were have been released.
The Red String of Fate Lost Fan Song- A fan vocaloid that was released on YouTube and Niconico Douga that featured a thumbnail with the sextuplets laying in a circle with a red string connecting them together. The red string wraps around Osomatsu’s finger and forms a heart in Todomatsu’s hands. The song had the brothers sing about their connection together before bursting into tears at the song’s climax. The video has been taken down since 2020 and is now lost media.
*Fetishmatsu- The part of the Osomatsu-San community that creates fetish media featuring Osomatsu-San characters. Please take caution when researching further, because I’m not messing up my search history any further.
*Live-Action Matsu Porn- Osomatsu-San being such a popular series, multiple live-action porn videos featuring the Osomatsu-San characters (mainly featuring Karamatsu & Ichimatsu). Examples include: Karamatsu Maturbates for You, IchiKara Hajimeyo!, and Ichimatsu Spanks It.
*Amputee Karamatsu- An infamous piece of fetishmatsu art that depicts Karamatsu with his legs cut off.
Osomatsu-Sanpo- A Pokemon-GO style game where players would find and catch different variations of the sextuplets through AR on their mobile device. It only ran from February to September 2017.
Swimsuit Hesokuri Set- An unreleased Hesokuri set which has the Matsu brothers wearing pretty plain-looking one-piece bathing suits. Possibly used for testing out game mechanics in updates.
What Does Sheeh Mean?- Iyami’s catchphrase which he will scream out when surprised. When asked what the phrase meant, Fujio Akatsuka never answered, leaving the phrase a mystery to this day.
*IchiKara Endurance Battle- An infamous doujinshi piss fic with Ichimatsu and Karamatsu having an “endurance battle.” Please take caution when researching further.
*Periodmatsu- An image of a Matsu brother drawn in period blood on someone’s thigh posted by the account “Periodmatsu”. It is debated whether the image was faked or real. Often confused for Period Drama Osomatsu-San, an episode from the second season of the anime.
*Banana Milky Way (Meiboku)- An infamous beastiality doujinshi with Ichimatsu and the tiger from S1E10.
*Assault Machine Gun- An infamous 2016 doujinshi by Tellmin in which the Matsu brothers are sexually assaulted and r*ped for not being able to pay their debts to Chibita.
Rejected Bathhouse Quiz Short- A rejected skit from “Christmas Osomatsu-San”. Airing only at the 2017 Spring Nationwide Invitational Screening Festival alongside clips of each Matsu brother depending on which room you entered. Now considered to be lost media.
*Todokaras- An infamous member of the fandom that scammed their fans/followers, groomed minors, promoted beastiality, abused animals, and claimed victimhood. This is just *some* of their behavior. Please take caution when researching further.
Thank you all for all of your support and patience, if you have any questions I will try to answer to the best of my ability!
