Restaurant owner Kenji Nagata has been stabbed to death. When the police begin an investigation, a bag of human bones is discovered in Nagata's car and Detective Kajikawa asks anthropologist Kumiko Misaki to perform an examination. She discovers that the deceased was a man in his mid-twenties and that he died more than 15 years ago. Meanwhile, suspicion for Nagata's murder falls on his apprentice chef Ryohei Miyamura due to the murder weapon being a kitchen knife. Afterwards, Miyamura breaks into Kumiko's lab, but manages to escape....