InuYasha

Season 1, Episode 53

Episode Title: Father's Old Enemy: Ryukotsusei

Air Date: 2001-12-03

Overview:

Totosai tells Inuyasha that piercing the heart of Ryukotsusei, the demon that gave his father his mortal wound, will make his Tetsusaiga lighter. Inuyasha then decides to kill Ryukotsusei.