Sis, I Was Wrong. Stop Docking My Pay

A new transfer student arrives at school. Because she keeps to herself, the class clique takes a dislike to her. The gang's boss, a tough delinquent girl, leads the bullying.

After the new transfer student beats up the gang leader, the tough girl comes back the next day, bruised but still bullying her.

But she cannot win a fight, and before long she loses her authority. Her underlings look down on her and start bullying her instead.

So the transfer student becomes the head of the group and starts bullying the tough girl.

But why does she always bully her alone in a locked classroom? And why is there a strange sound of water inside?

Theme: Don't bully others without thinking