Thread:Hielmiez/@comment-29752621-20180208024747/@comment-30379300-20180822005238

Yeah, because they introduce Sakuya on Part 3, so they hold Karen and Mirai's Binders for Part 4, it seems they prioritize main characters first, then new character and the rest, probably Ema and Maika also maybe Kaguya will get their own binders next year on January or February