In the shadow of Japan's most notorious serial killings, private investigator Takashiro Shuugo arrives in Zushi to probe the disappearance of a young woman from a prominent family. At the Kouzuki residence he meets the gentle Kazuna, whose striking resemblance to a former lover unsettles him, and she implores him to locate her vanished elder twin. Her father's grave assertion that the missing daughter is already dead deepens the mystery, blurring the line between fact and rumor in a town still scarred by war.