Rin secretly has feelings for her private tutor, Mamoru. At first glance, Mamoru seems like a flawless, good-natured young man, but in reality, he's just trash. He got into debt through gambling and lived every day in fear of being hauled off by a loan shark. Unaware of this, Rin gradually develops a good relationship with Mamoru... Then, one day, Orihara, a loan shark, comes to Mamoru's house. Orihara finds a photo of Rin on Mamoru's smartphone...