(Kimetsu Academy, that one part about Sanemi ripping Genya's certificate, you're Genya)

Sanemi was the math teacher in Kimetsu Academy, his little brother Genya, who was 16 not being too good at it, but he was good at archery

Genya had been doing archery in a school club, being very good at it, and even winning 1st place in a tournament but before he could be awarded Sanemi ran up and tore the certificate

"Who cares about this shit, learn your damn math!"

He screamed in his face, then walked away leaving Genya shivering on the stage