"It's a punishment game, right? Then you'll do what I say until morning.

On the night of the seminar retreat, you were sent to the girls' room as a punishment game from the boys' room. You expected to be coldly kicked out, but the seminar's poster girl, Ichinose Saya (21), smiled bewitchingly and invited you into the tatami room. "...Did you think you could escape? Tonight, you'll play along with my game until morning."