The series takes place in an alternate version of Japan called , in an alternate timeline where the Tokugawa shogunate remained active and has remained semi isolated from the rest of the world after their defeat by American forces in World War II. And the Americans have bases on Okinawa and southern great Japan. The story takes place at , an academy located at the base of Mount Fuji where children of military families train to become samurai warriors. The academy is in the middle of a power struggle between Yukimura Sanada and Matabei Goto of the Toyotomi faction and the powerful student council that rules the school, and Muneakira Yagyu, the owner of the Yagyu Dojo, and the mysterious Jubei Yagyu are dragged in the middle of the conflict.