Episode 20

'''Despicable Villain! The Mystery of Onigumo!' is the twentieth episode of the InuYasha'' anime. It first aired in Japan on March 19, 2001.

Plot
Kaede reveals to Inuyasha and Miroku that in a nearby cave, she and Kikyō once cared for a badly burnt thief, who ended up lusting for Kikyō and allowed his body to be consumed by yōkai from his desire for her and ended up creating Naraku. Naraku soon unleashes a corrupted Rōyakan upon them since Inuyasha is too injured to fight back and Miroku cannot use his wind tunnel with Naraku's Saimyōshō in the air.