Takao Kasuga life is boring. Each day passes much like the one before, an endless cycle of going to school, coming home, sleeping, and then starting it all over again. Instead of doing the things that his friends do, Takao focuses his time on reading literature instead, in particular Charles Baudelaire’s Fleurs du mal. But something inside him is reaching its breaking point, and a flower of evil is about to bloom.

Takao steals Nanako’s gym cloths in a fit of stupidity and confusion, which weights heavily on his conscience as he sees the effect his actions have. Plagued by guilt, Takao is approached by Nakamura, who reveals that she saw him take the gym cloths. Takao’s problems continue to multiply as he’s slowly caught in a web of sin.

Forced by Nakamura into Saeki’s gym cloths, Kasuga finds himself blackmailed into spending even more time with his tormentor. Strangely though, when Nakamura is accused of stealing money Kasuga finds himself standing up for her.

Nakamura and Kasuga slowly walk home, hand in hand. The next day, the whole class is in uproar. The ink covered Kasuga's name. Saeki is devastated, her clothes at the center of the destruction. The whole school gets informed. Kasuga pukes. Saeki confronts Kasuga, having noticed that the drawing on the floor was the same as on his favorite book. He breaks up with her.

Kasuga enters Nakamura's room. He finds her diary and starts reading it. He recalls what had happened. Nakamura comes back, seizes the diary and runs away. He follows her and catches up to her. This time, he asks her to make a contract with him: they'll do what they can in order to leave for good someday.