Episode 13

The Mystery of the New Moon and the Black-haired Inuyasha is the thirteenth episode of the InuYasha anime. It first aired in Japan on January 29, 2001.

Plot
Inuyasha, Kagome, and Shippo find spiderwebs crossing the river as the ride a boat downstream. They find a girl named Nasuza who despises demons especially Inuyasha and Shippo. Inuyasha behaves strangely. Kagome asked him why. Assuming he's afraid of spiders, they escape into the forest with Inuyasha in his human form. Myoga tells them it's because of the New moon.