Dōki (2011)

Detective Ryouta Udagawa searches for former colleague and rival Kazuhiko Soga who went missing after suddenly being dismissed from the police force. Kazuhiko Soga then became the prime suspect in a murder case. Ryouta Udagawa, already worried over the well being of Kazuhiko Soga, begins to have doubts about the murder case and the integrity of the police department itself.