Mysterious Dinner Table
Obtainability: This is a personal memoria for Mitsuru Inami. It is obtainable through completing the third episode of her Magical Girl Story and through the Support Gacha.
Single Effect: Charge Draw
MLB Effect: Charge Draw
Effect Definitions:
Charge Draw will replace that turns’ current discs with Charge discs.
TLDR: "Mysterious Dinner Table" is an important part of Mitsuru Inami's kit. If you have the character and plan on using her during Ranked, it will be worth it to invest in and max-awaken this personal memoria.
Review: This memoria is an important part of Mitsuru's kit, but first we need to talk about Mitsuru herself in order to talk about why this memo is good.
Mitsuru Inami is good for ranked mirrors and little else. Her stats are terrible-- she has very little ATK with most of the bulk of her stats being in HP and DEF. Her magia and doppel purposely deal very little damage and put her on par with the amount of damage that Sudachi will deal (aka, nearly next to nothing). Her magia and doppel themselves will give Attack Down, Accele MP Gain Down, MP Gain Down, MP Damage, Negate Status Ailments (for your team) and then HP Restore for your team-- all things that aren't useful in regular PVE.
But where is stuff like this useful? Ranked.
Her dealing very little damage makes her ideal in Ranked, because it means that you use her magia repeatedly without killing your opponents, ideal for racking up points to get a high score. Her charge conservation connect means that you won't lose your charge bonus if worse comes to worse and you're forced to use noncharge discs. Her magia will prevent the enemy from gaining MP so that they can't use a magia, and it will heal your team-- and having high team HP is another way to score points.
So, how does the personal fit in? Generally you aren't going to be using personals in mirrors, right? Well, as mentioned above, you want to have a high charge combo for your ranked mirrors points. Usually this means you'll want a team with a charge draw character so that you can easily draw the needed discs-- maybe even two characters with charge draw. That way both characters can charge draw and even puella connect with each other as needed.
Some characters, like Kaoru Maki, Swimsuit Madoka, Sae Kirino, and Tanabata Yachiyo will have charge draw as part of their Spirit Enhancement active. This makes them easy staples for Ranked Mirrors.
However, Mitsuru Inami instead has a Spirit Enhancement active of "Magia Damage Down, Magia Damage Down Further, and MP Gain Down" which is arguably just as if not more important than a charge draw. Why is this? Why not have her personal and SE active swap places?
This is because turn one is the most important time for that kind of Spirit Enhancement active to be used. You don't want to wait for turn two to use MP Gain Down, you want to use that shit ASAP.
Additionally, you aren't typically going to use Mitsuru Inami by herself as the sole charge unit. You're probably going to field her with another girl who has charge draw, as mentioned above.
That character will be able to charge draw right away if you need her to, so having two readily available charge draws on turn one isn't going to be necessary.
Lastly, Mitsuru Inami's Spirit Enhancement includes a turn one Skill Quicken. That means that you'll be able to use her personal memoria (or any other memoria with a low enough cooldown) by turn two.
Lastly, the stats on this memoria are low but actually play into Mitsuru Inami's kit well. With her passive MP Gain Up when damaged, you're going to want her to be taking hits-- and that means you probably want her to have a lower DEF than your other girls, as the Mirrors AI will prioritize units with the lowest defense to attack. By using memoria like this, you can keep Mitsuru's DEF low to help encourage her to take the hits needed to earn a Magia, but her high HP also means that she probably won't die to any of the attacks.
Overall she's a smartly made niche character who is very good at one specific mode in the game to the exclusion of any other, and her personal memoria is an excellent continuation of her kit.
You'll want to max awaken the memoria if you get it.