Mizuchi

Mizuchi is a mythical serpent demon who rules over the Tama River, but was sealed by Light Clan in the form of a mountain. Encountered by Yuko Yoshida and her friends on a camping trip to said mountain, Mizuchi takes Yuko's soul captive as punishment for dropping a jar in the river. Lilith offers to take Yuko's place as Mizuchi's prisoner, but finding Lilith too annoying, the snake instead returns Yuko's soul and embeds a magic orb in Lilith's vessel body. The orb will allow Mizuchi to indefinitely support the body's limited lifespan on the condition that Lilith cleans trash from the Tama River every day in exchange.

Appearance
Mizuchi appears as a giant white snake.