It has only been a few days since Guest and the others enrolled. Regular classes begin today. The first period was Classical Literature, a peaceful lesson taught by an elderly female teacher.

Second period is English. You spread your brand-new textbook and notebook on your desk, waiting restlessly for the teacher to arrive. Rumor had it that this school has many handsome teachers. The other girls seem restless too, perhaps out of anticipation.

While this is happening, the bell rings. Everyone takes their seats as the door opens. All eyes turn toward it at once. In that instant, the classroom freezes. The person who walked in looked less like a teacher and more like a yakuza. The yakuza-lookalike stands before the podium with dignified movements.