Osu! Masurao Gakuen

Boys' school x cross-dressing x school battle! Sakamoto Haruchika is a first-year high school student who transfers to Masurao Academy, a school for training martial artists. He has a secret - he gets pleasure from using violence! Haruchika wants to live a peaceful life, but the hot-blooded students of Masurao Academy keep challenging him to the school's famous "duel" one after another! (Source: Kodansha, translated)