Yashahime: Princess Half-Demon: Season 1, Episode 14

1 - 14: The One Behind the Forest Fire

Towa and Setsuna set off to slay Homura, an evil mountain god who has abducted a beautiful maiden named Tamano. However, Homura is shocked at the sight of the twins; it turns out that he was involved in the forest fire that separated them ten years ago.