InuYasha Movie 3: Tenka Hadou no Ken

Long ago, Inuyasha's father possessed three legendary swords. Tessaiga and Tenseiga passed to his sons, but the third blade, Sounga, was sealed away because the evil spirit within it craves slaughter and can open the path to the dead.

When Sounga awakens at the Higurashi shrine and returns to the feudal era, Inuyasha and Sesshoumaru are drawn into another bitter contest over their father's legacy. Yet the sword's true danger leaves the brothers with a choice neither enjoys: keep fighting each other, or combine what their father left them before Sounga turns the living world into a kingdom of death.