InuYasha Episode 32: Kikyo & Inuyasha, Into the Miasma
Episode 32 of 167 of InuYasha, aired June 25, 2001, 24 minutes. Available with English subtitles and dub where released.
Episode summary
Inuyasha and the others stumble across a cave full of demons fighting to the death. They soon discover that Naraku is using to find a new demon to integrate into his being. However, the large demonic aura brings Kikyo into the mess.