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 InuYasha and his companions to depart. Soon after leaving, Totosai is attacked by Sesshomaru. Once again, Inuyasha battles his older half-brother as Totosai's protection, but must now face Sesshomaru's new defense of the claw of a dragon.