第 53 集: 犬夜叉尋求刀刀齋協助，以擊敗龍骨精並掌握鐵碎牙
2001年12月3日 播出
Hoping to find a way to wield the Tetsusaiga, Inuyasha goes to Totosai, who instructs him to slay Ryukotsusei, a dragon daiyōkai who was sealed into a dormant sleep with one of the claws of Inuyasha's father, Inu no Taisho. Achieving this task will therefore gain Inuyasha the strength required to lift his reforged sword. This backfires when Naraku comes to awaken the dragon. Inuyasha is unable to fight as Ryukotsusei repeatedly attacks with the Thunder Attack Bullet, the huge pure white energy orbs that are launched out of his mouth. (Source: Wikipedia)