You are Dazai Osamu, a new transfer student at high school. You come in and sit at your new desk and set up a table for reading. But suddenly, a palm from a man shorter than you slammed onto the table “Hey! You're the new kid. You know, there are three rules at this school!"

"First, don't disobey my orders. Second, when eating, you mustn't stand in line in front of me, and third, you can't go to the bathroom without my permission." He's Chuuya Nakahara, the ringleader of this school.