Mystery writer Kanbayashi falls to his death in the alley between apartment buildings A and B. He fell from the hallway of the fifth floor of building A where his office is located. When he fell, for some reason Kanbayashi changed from his socks into sneakers and was wearing gloves. Megure questions the victim's wife Seiko and first one to discover the body as well as Sugiyama, building A's security guard. It seems Kanbayashi and Seiko were a couple of lovebirds. As the police proceed with the investigation, an accident, murder, and suicide all seem like possibilities. Countless mysteries surround the death, and Kanbashi's actions were mysterious as well. Conan narrows his focus and quickly draws closer to the truth of the fall, but...

On her way home from school, Ayumi sees Makabe carrying the unconscious body of his wife Yuri to his car. Believing the young married woman she sometimes visited was murdered by her husband, Ayumi and the Detective Boys return to the house to investigate. They are confronted by Makabe while they are looking around the yard. When they ask him where his wife is, he answers that she is in the mountains. Conan and his friends also question a deliveryman who says he heard someone scream in the house the day before. Convinced that murder is a real possibility, they enter the house using a spare key and find a mysterious doll that was not there before as well as dried blood on the floor...

Scriptwriter Yasue is found dead in her apartment hanging from a noose. Shibakaru, Sakaba, and Hamanaka all testify she was already dead when they visited her apartment during the presumed time of her death, and Megure believes she may have killed herself. Near the body are scattered 500 thousand yen and roughly a hundred pages of manuscript paper, but Megure determines they would not have been enough to stand on. After questioning, Conan uses his smart phone to investigate the three year old case of a group of thieves who murdered a couple and stole two million yen and learns the name of Yasue's young friend is Ganno Mamoru. Conan has already arrived at the truth of the situation.

Conan and his friends notice a young boy looking at an apartment from an alleyway and call out to him. The woman who lives in the apartment asked the boy to call the police if she didn't exit her room after three men came and left her apartment, as it would mean she was likely dead. Conan and his friends discover scriptwriter Yasue dead from hanging in the room. Based on the situation, Megure determines it was a murder. However, the men Shibakaru, Sakaba, and Habanaka who visited the room all claim she was already dead when they came to the room. The case has three first discoverers...

Nagami's body is discovered in the hotel pool. Megure questions Samaki, Hamaka, and Toyoshima regarding the actions they took after they left Nagami alone in the pool. According to the pool reception staff, between the presumed hour of Nagami's death between noon and 1 PM, Toyoshima, Samaki, and Hamaka each came to the pool in that order.

Conan and his friends go to a hotel pool where Nagami, daughter of the president of Oiso Finance, drowns to death. She had been wearing a diving tank and searching the pool for her lost necklace. Based on the crime scene, Inspector Megure believes it may have been an accident. However, the hotel bellboys claim the body in the pool suddenly appeared.

Haneda Shukichi, also known as Taiko Meijin, takes on Katsumata Chikara in a meijin title match in Yamanashi Prefecture. Just before the second day's match begins, Shukichi receives a threatening letter from a man calling himself the Headless Shogi Player who claims to have kidnapped Shukichi's girlfriend Miyamoto Yumi. In order to save Yumi, Shukichi announces he needs time to think and takes a taxi to Tokyo. Interpreting the code labelled "first game," Shukichi arrives at Meiji Jingu where he runs into Conan and his friends as they visit power spots. The code pointed to Kato Kiyomasa's well. After hearing about the situation, Conan searches the area around the well and discovers the second game's code left behind by the culprit...