As a young child, Asano Arisu suffered severe bullying from local boys. As she grew up, her disdain for men became a defining characteristic, leading her to enroll in an all-girls high school. When she meets her new roommate, the beautiful Fujimi Kira, who shares her hatred for men, Arisu believes it to be fate. However, both girls harbor secrets they must conceal from their strict Dorm Head, Kamitani-Sensei. Arisu keeps a pet ferret in the dorm, while Kira's big secret is that he is actually a boy - much to Arisu's horror. Despite her initial shock, she soon discovers that Kira is investigating the mysterious death of his older half-sister, who was apparently a former student at their school. Will Arisu be able to overcome her aversion towards men and assist Kira with his investigation? And just how perilous will the search for truth become?
