Kasuga (voiced by Shinichiro Ueda) is a typical young literary man. He is buried in books all day long. He regards the masterpiece "Flowers of Evil" by the famous French poet Baudelaire as the Bible. In Kasuga's heart, the classmate Nanako Saeki (voiced by Yoko Hikasa) is the symbol of the goddess. Helpless by his own mediocrity, Kasuga can only rely on burning eyes to convey his feelings. In an accident, Kasuga picked up Saeki's gymnastics suit. Under the influence of some strange circumstances, he took the gymnastics suit with Saeki's body fragrance into his bag. Unexpectedly, this move was completely seen by the bad girl Nakamura Sawa (voiced by Mariya Ise) in the class. When Kasuga wanted to return the gymnastics suit to Saeki, he found that the situation had developed to an irreversible point. Taking advantage of Kasuga's weakness, Nakamura and Kasuga signed a so-called contract. As the price of keeping a secret, Kasuga could not disobey any request of Nakamura. The flower of evil blooms quietly, controlling and being controlled, a twisted love between three people begins.