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.