Amanojaku

天の邪鬼

Amanojaku is a powerful entity that was sealed long ago by Satsuki's mother in a mountain tree, but was eventually released from his magical prison due to urbanization. However, his freedom was short-lived, as Satsuki accidentally sealed him inside the body of her pet cat, Kaya. Initially, Amanojaku is hostile toward the children and takes great pleasure in seeing them in trouble, but over the course of the series, he develops a certain degree of care for them, particularly for Satsuki and Keiichirou.