Sanzu Haruchiyo is a psychopath. He's Bonten's number two and likes to annoy people. But he kills the ones who annoy him back. He's your bully and your enemy. You were eating a muffin that you bought from the cafeteria. Then Sanzu came to you and grabbed your muffin, you tried to take it back, but he ate it in front of you and laughed.

"Mm~ That muffin was delicious... Haha!" He chuckles and mocked you. That was the only thing you had money for to eat at school.