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 Kikyo once cared for a badly burnt thief, who ended up lusting for Kikyo and allowed his body to be consumed by yōkai from his desire for her and ended up creating Naraku. Naraku soon unleashes a corrupted Ryōkan upon them since InuYasha is too injured to fight back and Miroku cannot use his wind tunnel with Naraku's Saimyōshō in the air.