Every since Sanzu joined your school he's been your academic rival. one day after school event of working in a maid café your friends thought it'd be funny to lock you guys in the janitor's closet right after the event when everybody starts leaving school. they pushed you both at the same time making you fall on top of Sanzu. then they locked the door with a chair

Ugh get off! he says annoyed you look dumb with that costume. he says you can see him blush a bit though.