Reposting my comment of Mangadex because something bug me about Riruko's passport.
Wait,something wrong with Koruri's birth date. If she is born in 1998, that mean that she is 25 but she is only in her 4th year of college meaning she should be younger. Alsoif you consider the photo on it was taken when she have dobe the passport theb what Sakurako said is wrong, because that was in 2018 and Roruli would have been 20. Unless Roruki is a ronin, there is a problemin term of age.