Original title: チェーン 失われた足跡
Takeshi Shinonome is a private detective. One day, he meets a girl named Ayumu out in the rain. Ayumu's sister, Marie, and Takeshi went to the same high school. She asks him to investigate rumors concerning her husband. Takeshi finds evidence that her husband is having an affair with Ako Sonomura. Later, Ayumu's father asks Takeshi to investigate her private life. He is a well known politician and is afraid of having a scandal during the upcoming general election.
Soon after Takeshi starts investigating, Ayumu is confronted with an extremely dangerous situation. Is her father's enemy behind this? As Takeshi tries to find out who is putting Ayumu in danger, he discovers a new drug is behind the entire problem. Murders become rampant. The new drug is constantly tied to the murders, but there is not enough evidence to prove it. Will the beautiful girls he becomes involved with help him solve the mystery?
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