While walking around town the Detective Boys hear a woman in an apartment scream. They investigate the source of the screaming and find a dead old woman stuffed inside of a Sofa. The police arrive and interrogate Sanae Hosono, the woman who found the body, and learn that she recently bought the sofa from a flower shop. While the police question the inhabitants of the apartment, The Detective Boys along with Takagi, interrogate the employees of the flower shop who bought in the sofa. They learn that the sofa was found on the curbside of the apartment. Mitsuhiko concludes that the culprit is Kazuhiro Tokunaga due to the instability of his alibi. Takagi confronts Tokunaga who confesses and reveals he murdered her in rage when she threatened to take everything away from him.