Famicom Tantei Club: Kieta Koukeisha is a text adventure game. The protagonist is found on the ground near a cliff by a man named Amachi. The protagonist can't remember anything, and finds that he has amnesia. After some rest, he returns to the cliff and meets a young girl, who informs him that he is an assistant detective investigating the death of someone named Kiku Ayashiro. He heads over to the Ayashiro estate, learning that in the village there is a saying that the dead will com back to anyone who attempts to steal the Ayashiro family's fortune. As he keeps investigating, he learns that there may be a connection between this legend and the serial killings in the village. The game has a horror movie-like atmosphere. Actions are controlled by selecting text commands like interrogate, examine, or move. The Famicom Disk System version comes on two disks released on different dates. All later releases have both parts in one release.

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, and heads over to the nearby Ayashiro estate located in Myoujin village. The Ayashiro family owns a huge plot of land passed down from generation to generation, but there is a strange saying in the village that the dead will return to life to kill anyone who attempts to steal the treasure of the Ayashiro family. As the protagonist investigates the mysterious death of Kiku Ayashiro, he discovers the terrifying connection between this saying and the serial killings which take place.