Hitorishizuka

In a residential area, a man is murdered by another man, who broke his apartment. Sergeant Kizaki, who is working near the area, hears a gunshot and runs towards the apartment. Detective Omura already is at the scene of the crime.
During their investigation,they get closer to finding out the identity of the killer. Soon, Sergeant Kizaki feels someone is behind the case. A girl then steps out from the shadows. Sergeant Kizaki feels she is linked to the murders somehow.
(Source: AsianWiki)