On the rundown side of the famous Momosu Island lived two girls and a cat. Despite not knowing anything about her current housemate, Lilian didn't hesitate to provide shelter for the other girl, making the girl feel indebted to her. Everything was normal. They were scraping to pass by but they, or at least one of them, was content. What would happen when the other girl signed her organs away to pay off her debts, and why and how suddenly she deceived everyone and enrolled in the well-known Momos academy for boys?