I also came here to say that I will riot if this Junior interrupts the fluffiness of the main couple in the slightestIf some random unnecessary drama starts I will go berserk
People are taking it as this will go harem or triangle route, which to be fair has happened to many series specially when the rating started to drop and they needed to add in some "spice"Shouldn't she say "Onii-san, you lost your commuter pass" in the last page? She's holding one.
Also. Why in Oblivion should her appearance destroy the fluff? She'll obviously think they are an item!