Takuma Zushi simply wanted to be left alone. He naps in class and avoids club activities. On his way home, he spots a girl heading into the woods and decides to follow her. There, he witnesses a duel between two sword masters, with the ownership of the "Kandachime"—a sword capable of transforming into a person—as the prize. That girl, Otowa Hagane, was on the verge of losing when he naively intervenes in the fight...