Professional golfer Banno lives in the apartment next door to Wakasa-sensei's, and his girlfriend Kurumi has been murdered. Banno claims he was attacked by a strange woman, but Conan believes Kurumi was murdered by Banno. Several residents of the apartment saw a strange woman. She was also on the security camera footage of the elevator. The police proceed with the investigation with a crazy fan of Banno's as their suspect. Conan is still unable to solve the trick Banno used to write on his own face, but Ai and Genta's comments bring him closer to the truth...

Ayano visits Mifuyu's apartment where she discovers Mifuyu bleeding from her chest. After saying, "Tabata-san is... Run," Mifuyu dies. Ayano explains the situation to Kogoro and Conan, who happen to be passing by the apartment building. They head to the apartment, but the body is missing. Mifuyu was conned out of ten million yen by Tabata, the man she was seeing. Kogoro reasons Tabata killed Mifuyu to silence her. Later, they head to Tabata's home in order to question him, but... The case begins to rapidly unfold.