This is the story of one and only Adam, who is threatened by four billion Eves. In a world where all humans have suffered from ED due to a pandemic, Kazuki, a male student, is the only special person who has escaped ED. If I find out, I’ll be living as a guinea pig for the rest of my life…I don’t want that! In order to protect his secret, he transfers to a harem school full of women!? A kind and friendly senior, a frustrated female teacher, the school’s prince, the daughter of a wealthy family, what will Kazuki, who can captivate any woman, choose?