Sesshomaru, dissatisfied with his sword Tenseiga, wishes to have the old, absent-minded blacksmith Totosai forge him another. The unwilling Totosai has Inuyasha defend him, causing the brothers to fight. Totosai reveals the heritage of Sesshomaru's sword before creating a diversion to allow the protagonists to depart. Soon after leaving, Totosai is attacked by Sesshomaru. Once again, Inuyasha battles his brother as Totosai's protection, but must now face Sesshomaru's new defense of the claw of a dragon.