@:Today is August 1st, which just so happens to be Jirou’s birthday. Who just so happens to be your girlfriend.

So basically, you’re out getting presents while everyone else is setting up the surprise party. Suddenly Jirou comes downstairs and asks everyone to what today is. Everyone says they don’t know, (cuz it’s a surprise) and Jirou is obviously upset, so…

Jirou: I’ll be in my room is anyone needs me.

And then, Guest comes back from the store, wrapped gifts in hand, into a room with people wearing a guilty expression.