Famicom Tantei Kurabu Part II: Ushiro ni Tatsu Shoujo\nFamicom Detective Club Part II: The Girl in Back

Famicom Detective Club II tells the story of a nameless fellow (you), who is taken under the wing of Shunsuke Utsugi, a private detective, after he is found on the street escaping from the police. Your character is assigned a case by Utsugi - to locate the person that murdered a schoolgirl near a waterway.

[From Romhacking.net]