From DGT: When Asano Aris was small, local boys were very mocked her, now she is a high school student and is famous for his fierce hatred for men and joints at school for girls. When Dazzling Fujimi Kira enters and becomes her bedroom neighbor, proclaiming that she also hates men, Arisu thinks that this should be a predetermined reunification. However, both have the secrets that they should hide from the Boss Bedroom, strict Kamitani-Sensei: Aris with a ferret as a pet in the bedroom, and Kira is the fact that he is actually a child, to the horror Aris. It seems that he is studying at school to reveal the secret of the alleged suicide of his senior summary sister 2 years ago. Will Aris can cope with the need to divide the room with a guy, not to mention to help him in his research? And how dangerous to solve the secret?