y'know the funny thing about yamaguchi and futakuchi having the same birthday is that three years ago i gaslighted myself into believing that they met in a grocery store while they were in uni because they both wanted to buy a cake for themselves at like eight in the evening, but ended up arguing over it because there was only one left. only for it to be taken by a child. then long story short they ended up buying one together elsewhere and hanging out for hours in what they consider to be their first accidental date nowadays :)
my brain genuinely believes it to be canon. no intention to rectify tbh it's so funny to me because their personalities are opposites so their friends are all like. how did this even happen wth yamaguchi are you okay? (he is, don't worry!)