Azusa, who lost her husband 10 years ago, lives with her only son, Kenichi. However, even after her husband died, her son did not show any signs of working and remained holed up in his room. The family's only income comes from Azusa's small part-time job, and Kenichi's mother persistently urges him to have money to play with, but when he learns that this is not going to come true, he begins to take up consumer loans without permission, and the money continues to grow. Kenichi, who is having trouble repaying his debt, takes advantage of the sweet temptation of installing a hidden camera in his home and waiting for him to repay the interest.