Cirno was the one who thought about it first though.Huh? ...Ah, that's right, but......Um... were you playing a game and got too engrossed in it? Having fun is fine, but-That's not what we did...To be that late... what on earth were the four of you doing this morning?That's not it!...Today is Keine-sensei's birthday, right?That's why all of us decided to make a birthday present for Keine-sensei.
