Ren is a young man who has struggled with his affinity for women. In order to overcome this weakness, he enrolls in Somenoe University, a prestigious university with a female student ratio of 90%, and lives in a former girls' dormitory where there are only two other men, including himself. Ren is nervous and anxious about his future. On his first day at the new school, he is invited to have sex by a cool female senior student, Kurenai! Will Ren, who is not good with women, be able to start a rosy harem life?! ...Or so he thought. Things take a sudden turn. A woman's body is found dead on campus. What's more, there is something strange about the university's strange atmosphere and the way the girls look at him. Is it just an ordinary university, or...?! Must he escape the temptations of dangerous women at a university with a female student ratio of 90%?! A school suspense horror story where pleasure and fear swirl, where doing something will end something! (Source: Kadokawa, translated)