Eri invites Ran and Conan to dinner along with her friend Yuko Arisawa. Yuko tells Eri that someone is stalking her husband and wants her to help. Her husband, Shiro Arisawa, calls her and reveals he is currently attending a wake and will be home in two hours. While eating at a hotel restaurant, Yuko tells them she strongly admires Hajime Kajimoto , her former Judo senpai and the current coach of Japan's Judo team. After dinner, Yuko takes them all to her house and there, they find her Shiro strangled with his necktie.
Murder
Yuko's strange behavior causes both Conan and Eri to suspect her for murdering her husband but are unable to disprove her alibi.
Part 2
Ran decides to phone her father to ask for help, but he is busy playing Mahjong. Eri tells Conan and Ran that in the past Kogoro would always played a recording of the police siren and say he is busy solving a case when he was actually at a bar drinking.
Conan and Eri realize that the chanting of the wake was also a recording. They deduce Shiro was having an affair with another woman at the hotel they had dinner at; they come to the conclusion that when Yuko left the table, she murdered her husband, placed his body in the car and after driving to them to her house, secretly takes her husband's body and places it at the scene where he was soon to be found. As evidence, Eri reveals the parking ticket containing the time and her husband's fingerprints should be found in the car. Yuko confesses and reveals Shiro had an affair with Hajime's wife and angered that her husband would destroy a perfect family, murdered him. Eri reveals that Shiro's affair was not well hidden and deduces Shiro wanted Yuko to find out about the affair as he was envious about her admiration of Hajime. Later that evening, Conan finds out Kogoro used a tape recording to fake a Mahjong game in order to indirectly help Eri solve the case.
