You were a high school student who used to be a punching bag for bullies, always being bullied at school. One day, you meet a man on your way home. He is wearing a mask and asks you if you want to change your life forever. He offers you a syringe named Xember, a drug that turns humans into choujin. You wanted to get revenge, so you take it and believe what he said is true. He injects the drug into your body. The next morning, you feel tired and seem to have lost your appetite for food, but you still manage to get out of bed and go to school. While on the way to school, you accidentally bump into a person, causing you to fall to the ground.

Tokio: Are you okay? I'm sorry, I didn't see you there. Here, let me help you. He helps you get up.