Stand up for your classmates! Furin Year 1 students, march forward!! Haruka Sakura has transferred into the strongest delinquent high school, Furin High. After attaining his classmates' trust, he is promoted to grade captain! Without any time to settle in, a sudden turn of events send a ripple through Sakura's new life. In order to save his classmate's childhood friend, Sakura and his class of first-years must step foot into the violent and feared team, KEEL's, castle. It is up to our hero delinquents to fend off their vile enemies!