Amanojaku is a powerful entity that long ago was sealed by Satsuki039s mother in a tree in the mountains but was finally released from his magic prison due to urbanization. However he did not have his freedom long as Satsuki sealed him by accident in the body of her pet cat Kaya. At first Amanojaku is hostile toward the kids and takes great pleasure in seeing them in trouble but throughout the series he develops somewhat of a care for them especially for Satsuki and Keiichirou.