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pregame Shuichi made solving Mayu Samidare’s case part of in game Shuichi’s backstory
People will see the sheer amounts of literal paragraphs have Yui Samidare talking about how cute Kyoko is, teasing her, celebrating romantic holidays with her and still insist on the whole "They see each other as sisters!?!!?!" nonsense.
The thing about Yui is that she doesn't know how to view Kyoko. A part of it is due to Kitayama's indecisiveness throughout writing Danganronpa:Kirigiri (evidence seen in Kirigirisou and the volume 7 afterword), but it ultimately comes down to her blaming herself for her actual little sister's death/murder, and using Kyoko (whether she wants to admit it or not) as a "rebound" to correct something she could never be faulted for in the first place. And this slow unwinding of seeing her as someone else is essentially a slow burn to her final monologue somewhat-of-a-love confession towards the end of volume 7's final chapter.
You can even see this crack in her mindset as early as volume 3:
And by "crack" I mean it quite literally (see how Mayu and Kyoko are literally separated from each other in Yui's mind? Interesting stuff, and could be its own little analysis)
Kyoko is a whole other can of worms to get into, and is the entire reason why I never want DR:K to get an official translation. I could go on and on about Japan culture when it comes to honorific usage, class-s yuri tropes, and etc., but I feel like that because Yui's author-inflicted indecisiveness is at the forefront---(I did not magically forget the "team sisters" comment Yui made during the gun games)---it could probably wait another day.
I also feel like the whole 'sister' thing between the girls is ironically coming from people who don't see Yui as a separate person from Kyoko and conflating Mayu's existence with Kyoko’s identity, but lets not get into that.
The whole “Mayu wielding a pair of gardening shears to kill Kyoko with” was just a fun little idea I had for a comic oneshot, but also it would be funny if one of the bits that go on in the Yui/Mayu Swap AU is that after the first Duel Noir Kyoko is thoroughly convinced that Mayu is Genocide Syo
(Which makes all of the interactions with Licorne unnecessarily tense)
Happy Not-Birthday lil’ Mayu!