Chapter 1

The story begins as Usobuki and Kijima are having a drink at the 'Colorful Cafe'. Usobuki then suggets Kijima that his drink is poisoned and tells him to die peacefully, triggering Kijima's immediate doom. Usobuki then leaves the scene.

We are then introduced to Katsumura and Yame, who discuss the death of the loan shark Kijima. The autopsy reveals that Kijima hadn't drunk any poison before his death. Yame decides to investigate the man she saw on the security cameras, Usobuki.

Before this she remembers the suicide of Katsumura's son, who she had wrongfully accused of complicity with a robber, and who decided to kill himself because of it.

Her and her colleague then arrive in a park where Usobuki sleeps on a bench. She wakes him up and as she starts questioning him he asks her to feed his cats. She accepts but is scratched by a cat because she loses her temper. Usobuki then licks her wound and walks away. The officers do not pursue him, as they start worrying seeing Yame's wound becoming swollen.

Yame is then examined by a doctor who tells her only saliva got to her wound. She then discusses it with Katsumura who tells her about False Belief, and the Defense by Impossibility used in court. He mentions how she didn't believe his son in the past, and this makes her feel guilty.

Yame, feeling guilty and lost, comes in the park at night in order to ask Usobuki what she should do. He then kisses her and they end up having sex. Usobuki tells her afterwards that this night she will die. She asks him what his objective his and he answers 'to prove that humans are weak'.

Yame gets home and takes a bath. In her bath, her swollen wound talks to her, telling her that she will die. She then tries to get rid of it with a razor blade, cuts herself and ends up losing consciousness because of the sight of her own blood.

Polices officers find her corpses and judging by the circonstances, rule it as a suicide.

We see Katsumura in the park, who comes to talk with Usobuki. It is revealed that Katsumura was the one who requested Yame's death to Usobuki, in order to avenge his son's death. He reveals all of this while talking, but he was actually still at the police station, under a false belief. We can assume that Katsumura was arrested on the spot.

The chapter ends as Usobuki, feeding his cats, says that 'humans are so stupid'.