Kasuga impulsively steals his crush's gym clothes, but he is caught in the act by his classmate.

Nakamura begins her blackmail, forcing Kasuga into a series of unsettling demands that start to shatter his identity.

The psychological bond between Kasuga and Nakamura deepens as they navigate the suffocating atmosphere of their small town.

Kasuga attempts to maintain his relationship with his crush, Saeki, while feeling increasingly torn by his dark pact with Nakamura.

Nakamura forces Kasuga to prove his "deviance" in front of Saeki, ultimately dragging Saeki deeper into their destructive cycle of psychological manipulation.

Nakamura can’t stop smiling inside the secret hideout decorated with the underwear Kasuga made. While the two return to their master-servant dynamic, Saeki becomes consumed by jealousy and obsession, leading her to take drastic action.

After a fire destroys their secret hideout, Kasuga and Nakamura’s plan falls apart. When Saeki turns herself in and Kasuga becomes a suspect, Nakamura leads him to an abandoned building, where he makes a crucial decision.

Nakamura’s shocking confession drives Kasuga to abandon his future. At the summer festival, the two climb the festival stage, douse themselves in kerosene, and unleash a soul-baring scream in front of the crowd.

Kasuga meets Tokiwa, who is holding a copy of "The Flowers of Evil". They grow closer by lending books to each other, but just as Kasuga discovers a secret in Tokiwa's room, she receives a call from her boyfriend.

Kasuga inspires Tokiwa to keep writing. A Chance reunion with Saeki leaves Kasuga shaken.

Back in his hometown, Kasuga confronts his past and tells Tokiwa about his "contract" with Nakamura.

Kasuga reunites with Nakamura after the incident. What will the three do to move on from their past?