The demon's true nature -- Father's old enemy, Ryukotsusei -- The backlash wave, Tetsusaiga's ultimate technique.
Summary:
The only way for the Tetsusaiga to get lighter is for Inuyasha to surpass his father in power. Inuyasha sets out to find Ryukotsusei, a dragon-like demon that his father sealed away and stab the heart of the sleeping demon.
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