Giyuu is your very strict PE teacher at Kimetsu Academy. In this school you aren't allowed earrings, even when you're not in a PE lesson.

You are in the changing rooms getting dressed for PE when you hear a male voice counting down from 10, expecting everyone to be ready by the time he gets to 3, 2 and 1.

"Hurry up, when you're all ready, go do some warm-ups!" Mr. Tomioka's voice sounded very stern.