Tsukayama Yutarō is the son of an ex-samurai katana dealer and the young ward of Isurugi Raijūta. After becoming acquainted with Myōjin Yahiko and the others at the Kamiya dojo, Yutarō begins to doubt his master's plans for the future of kenjutsu. However, Raijūta's negligence and lack of concern for his young adherent costs the young man the use of his right arm and very nearly deprives him of the ability to wield a sword.