Enjin Hiizumi

比泉円神

The main antagonist. A youkai who somehow is determined to destroy the barrier protecting the city for unknown reasons. [Spoiler] Later is revealed that he has no physical body and is, in fact, possessing the body of Gin who happens to be Ao's older brother, a Satori (mind-reading youkai) who was best friends with Hime and Akina. [/Spoiler]