Oya High School is known for its delinquent students and fierce reputation. The school is a ruined battleground where strength and respect are paramount, with students constantly vying for dominance. The leader, Murayama Yoshiki, and his loyal allies—Furuya, Kaburagi, Seki, and Todokori— run the school. Oya High's students are known for their relentless fighting skills and strong bonds. The students can be rather violent even when joking.