Detective Ryou Hayama holds an important position leading the Criminal Investigation and Crime Prevention Division at the Josai Police Station. Detective Takehiko Kawamura, Ryou's partner, was originally a detective at the main police headquarters. However, after his father, a forensic investigator at the Josai Police Station, was murdered, he requested to cooperate with the Josai Police Station's investigation. After the case is solved, Takehiko is officially welcomed as a member of the Criminal Investigation and Crime Prevention Division at the Josai Police Station.
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