At the beginning of the first episode, police captain, Onizuka Heitaro, and his men were heavily guarding a museum to prevent Mouse from stealing a golden skull that was on display there. Just then, the ground around the museum began to shake and crack open, causing the entire building to sink into the ground. Then, Mouse was spotted standing on top of the museum who leaves a card with his symbol on it. This angers Onizuka and made him vow to capture Mouse one day.
The next day, Sorata Muon was seen running late to work, where he was encountered by math teacher, Mei Momozono, who solds Sorata for being late and tells him to take his job seriously as an art teacher. Physical education instructor, Hazuki Kakio, comes in, agreeing with Mei and telling Sorata to act like a man for a change. Then, school nurse, Yayoi Kuribayashi appears and hears about Mouse's situation about arriving late, so she offers him a formula to help him stay up from running late again. Sorata is later seen placing the Golden Skull he stole in a display case.
- He was voiced by Grant George in the English version.