Tatsuma Hiyuu, a quiet senior in high school, transfers to Magami Academy in Shinjuku in the spring of his senior year. The enigmatic boy's "outsider" status and advanced martial arts talents rapidly gain him the friendship of Kyouichi Houraiji, a class delinquent. He also meets Yuuya Daigo of the wrestling club, Komaki Sakurai, the leader of the ladies' archery club, and Aoi Misato, the Student Council President, through an odd connection and a chance challenge.