To be that late... what on earth were the four of you doing this morning?

...Um... were you playing a game and got too engrossed in it? Having fun is fine, but-

That's not it!

That's not what we did...

...Today is Keine-sensei's birthday, right?

Huh? ...Ah, that's right, but...

Huh? ...Ah, that's right, but...

That's why all of us decided to make a birthday present for Keine-sensei.

Cirno was the one who thought about it first though.