One night, a passenger car driven by Kyoko hit and killed a woman. Her husband, Dr. Nogami, who was a passenger in the car, hid the body in the grass and they returned home. Soon after, an autopsy by the police revealed the identity of the woman. A few days later, the woman's lover, Ueda, calls Nogami demanding that he keep quiet.
A wheelchair-bound daughter is told that her mother's death was a murder and asks for an investigation, gradually learning the secret of her own birth.
One day, Mio, a reporter, is shown a manuscript for a contest by Kuribayashi, the editor-in-chief. The manuscript, which she is told will likely make it to the final round, is that of Kashiwagi, who was supposed to marry Kuribayashi's daughter. Hearing the familiar name, Mio learns that Kashiwagi is now married to the daughter of a top company and holds a high position. The two are nostalgic about their reunion, but soon after, a series of murders occur. Mio investigates the case to prove Kashiwagi's innocence, even though he was suspected of murder.
