Aku no Taizai: Venomania-kou no Kyouki

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.

Having stood up for Nakamura, Kasuga finds himself at odds with the rest of his class. But just when it’s looking like things can’t get much worse for him, his idol, Saeki herself tells Kasuga that she though it was very cool of him to stand up for the strange girl. Armed with a tiny fleck of light in the growing gloom of his life, Kasuga is elated and even finds it in himself to ask Saeki on a date, which she surprisingly accepts. Kasuga tries to keep it from Nakamura, but when she inevitably finds out about the impending date, Nakamura decides to push Kasuga even further into the darkness.

Nakamura stalks Saeki and Kasuga as they go on their date. She forces Kasuga to wear the stolen gym clothes underneath his own.

Saeki tells the whole class that she and Kasuga are going out. Kasuga gets nervous when he sees Nakamura talking with Saeki, wondering if she is revealing his secret.

Kasuga is intent on ending the charade and confessing his sins to Saeki. Nakamura invites him out after dark, where they make their way to the school to confront their demons.

Kasuga and Nakamura walk home for what seems like forever.

Kasuga's world is falling apart around him, and he's fallen into a near catatonic state. Saeki appears at his window, wondering why he did what he did and demanding answers.

Kasuga and Nakamura escape into a rain filled night, determined to get to the other side. Saeki goes out in search of them, only for Kasuga to reveal his true self to both girls.

Kasuga is lost withim himself with sadness. The two women in his life have abandoned him, and the road ahead seems bleek and uninviting.

Determined to right his wrongs, Kasuga sets out to prove himself to Nakamura, and accompany her down the twisted path she walks.

With the turn of his wrist, Kasuga enters Nakamura's private world, getting more than he bargained for in the process. Together, they prepare for what lies ahead.