Osu! Masurao Gakuen

Haruchika Sakamoto is a first-year highschool student who has transferred to the martial arts school Masurao Academy. He has a certain secret however; violence gives him pleasure! Though he would like to have a peaceful school life, the hot-blooded students of Masurao challenge him one after the other to the academy's famed duels!

(Source: Kodansha, translated)