Shungo Ninomiya is a normal highschooler with a normal mercenary sister and a normal mansion for a home. But his normal(ish) life is about to get flipped upside down when the beautiful and strangely magnetic Mayu Tsukimura and her brother, Mikihiro, are sent to live with him. Mayu may seem like your run-of-the-mill teenager, but she's got a big secret: she's a succubus with budding powers she doesn't yet know how to control. And to top it off, she's terrified of the very thing that gives her life MEN! Now, it's up to Shungo to cure her of her androphobia, but it won't be easy. His sister, Ryoko, has cooked up a full immersion therapy plan, including sleeping in the same bed, bathing together, and role-playing. And his childhood best friend isn't happy about Shungo and Mayu's uninterrupted quality time. Can Shungo cure Mayu before she or he--loses control?