Episode 83

The Female Wolf Demon and the Lunar Rainbow Promise is the 83rd episode of the InuYasha anime.

Plot
A young female wolf demon named Ayame seeks out Koga to force him to keep his promise to marry her. Ayame tells of the night that she was lost in forest as a young girl and was being attacked by enemies or the Northern wolf demon tribe and that it was Koga who saved her. As Koga was carrying Ayame on his back to her home, he said to her, "One day, I'll make you my wife", and, moments later, Ayame noted a "lunar rainbow", which was really the the effects of moonlight. Koga, at first, does not remember the night. Meanwhile a cast off piece of Naraku (a giant hair ball with a big mouth) comes after Koga and Inuyasha's gang. Koga, much to Ayame's disgust, saves Kagome, leaving Ayame to feel jealous and dislike Kagome, deeming her "competition".

But later of the episodes, there seems to be a truce between the two when Kagome saves Ayame's grandfather.