ファミコン探偵倶楽部 消えた後継者

The story begins with a man named "Amachi" discovering the fallen protagonist on the ground near a cliff. The protagonist discovers that he has lost his memory, and after recuperating, he revisits the cliff and meets a young girl named Ayumi Tachibana. He learns from Ayumi that he is an assistant detective investigating the death of Kiku Ayashiro. [From Wikipedia]