The events take place in Japan during the reign of the Edo dynasty. At the center of the plot is a mixed-race master swordsman who leads a secret life. The main character is consumed by a desire for revenge. He has been planning a grand vendetta for a long time. The story begins with Mizu, in the year 1633, being labeled as an outsider because of his piercing blue eyes. The hero is not ready to play the role of an outcast. He makes contact with a young noblewoman named Akemi. Thus begins his path of revenge, full of thrilling adventures and trials.