Tengoku de Akuma ga Boku wo Miwaku Suru天獄で悪魔がボクを魅惑する; The Devil Fascinates Me In Heavenly Prison

Set on a solitary island in the distant sea, a dangerous school life begins! Kaoru Jahana, a boy who aspires to become a true man, begins his high school life on a solitary island in the sea. There, he meets a charming girl, Kanra, who is actually a demon who feeds on men's spirits...and it turns out that all the women on this island are the same demons!?