Megachu!

Japanese Title: めがちゅ!

English title: Oh My Sex Goddess

Plot
Kōsuke Kawakami is a college student who suffers from unexplained nightmares in which he's "a rampaging sex demon".[2] One day, a goddess known as Jordh appears before him and wants to destroy the evil demon inside him which is causing his erotic dreams about his roommate, Natsuki Kurosaki. Another goddess, Fauna, decides on an alternate means of stopping the demon. However, Natsuki has plans of her own for Kōsuke, and later joins Jordh to defeat the demon.