Eishirou is a strong ninja of the Fuuma clan. He is married to Rikka. He is also the father of the twins, Isuke (Shirasu) and Isame (Kotarou). Like his wife, he is very protective of their children. He is committed to the clan and the safety of his family.
The current head of the Fuuma clan orders people to kill their kin, as part of their rite of passage to become full-fledged Fuuma. After Isuke expressed his wish to always live as a family of four in the village, Eishirou later plans to assassinate the head of the clan. After his assassination attempt fails, he allows Isuke to kill him so that the elder son could have his rite of passage. Instead of dying as a traitor of the Fuuma clan, Eishirou chooses to die as a target for Isuke.
