Ren is a young man who has had a hard time because he is not good with women. In order to overcome his weakness, he enrolls in Somenoe University, a highly selective university with a 90% female ratio. He finds himself living in a former women's dormitory where there are only two men, including himself!! Nervous and anxious about his future life, Ren moves in with his senior classmates. On his first day at the dormitory, a senior female student, Kou, made him a visit at night! It seems as his life in a harem is about to begin, but things take a sudden turn when a female corpse is found dead in the university. Moreover, there is something strange about the atmosphere of the university and the way the girls look at him. It is a simple university or maybe…!!?