Kozaburo, who dreams about becoming a doctor, moves to the countryside to focus on his university admission exams. However, in this female-only town where he is moving to, three extremely beautiful sisters are living in his lodging house?!! Besides, this town has a secret... it was a town where the Japanese version of Succubus, "Hinoenma," resided. Beings who steal men essence. The 3 "Hinoenma" sisters in this town especially, wanted to try and sexually devour our protagonist!!! Can Kozaburo concentrate on his studies in such an unpleasant environment?