Megachu(2007)

Megachu is an adult anime series that follows Kousuke, a college student plagued by nightmares where he transforms into a rampaging sex demon. When the goddess Fauna discovers he harbors an evil demon's power, she proposes an unconventional solution: intimate encounters with her and Jordh, a sultry potion-maker. Complicating matters is Natsuki, a mischievous devil with her own designs on Kousuke. As supernatural forces converge around him, Kousuke must navigate desire, danger, and the mystery of his dormant demonic nature. The series blends comedy, fantasy, and mature themes as he grapples with his cursed existence and the women determined to either save or seduce him.