Actor Tokuzono falls from the fourth floor of a school being used as a filming location. AD Odori figures out the culprit's identity and sends them a message as he appears to be plotting something. The police begin their investigation around the unnatural placement of Tokuzono's phone. Meanwhile, Sera asks Conan and his friends about Kudo Shinichi...

Conan, Ran and Kogoro are called to Moonshima, a small island in Izu, in a letter from a mysterious client. However, the client was a pianist who should have died playing the piano sonata "Moonlight" 12 years ago. The third memorial service of the former mayor, which I happened to see at the community center that I visited to investigate the client. In the midst of that, "Moonlight" began to flow...

Conan, Kogoro, Amuro, and Irohazushi chef Wakita take the Azusa limited express to Nagano. Originally, Sonoko was supposed to go with them, but she fell ill. Since Ran stayed behind to visit her friend, Amuro and Wakita took their places on the trip because the client Nichihara Taisei insisted in his letter to Kogoro that he bring a group of four. Included with the letter was a code written in katakana. The client's request is, "My old friend hanged himself in an abandoned church deep in the mountains of Nagano, and I have no idea why. Please decipher the code and tell me the truth." In the chapel of the abandoned church they arrive at, they find five of Nichihara's former high school classmates...

The Detective Boys follow Detective Chiba after they see him purchasing a large amount of food at the convenience store. He enters an ordinary apartment building. The kids wonder if he's come to visit a friend, but Conan explains that the building is new and deduces that Detective Chiba must be conducting a stakeout here. They follow him inside, where they find Detective Takagi as well. The Detective Boys ask to stay until the professor can come pick them up and learn that the police are staking out this building because of the jewelry store robbery that occurred the previous week.

Appraiser Nishitsu Hogen is knocked to the ground and then stabbed to death with a spear. The police look for someone who can appraise the black lacquer trays at the crime scene but have trouble finding someone. While searching the house, the police find a box containing the dish Professor Agasa sought to have appraised. According to the housekeepers, Nishitsu said he was looking forward to seeing the surprised faces of the clients he had coming that day...

Professor Agasa, Genta, Mitsuhiko, and Ayumi are eating at a third-story restaurant in the city. While looking outside from their table, through the curtains in the window, they see the silhouettes of a man and woman enjoying a party in the apartment building across from them. However, the scene shifts, and the man appears to attack the woman. The hurry to call the police, but...

At the apartment where Shukichi attends shogi study sessions, Genda Yasukiyo, one of the group's members, is murdered. The home of former study group member Kishimoto Yuhei catches fire, and his body is found inside. Meanwhile, Shukichi seems to have noticed a clue to the culprit's identity and is kidnapped. Conan meets up with Akai, and together they go to rescue Shukichi.

Conan, Ran, Sonoko, and Sera attend the birthday party of their classmate Sekizawa Yumi and her older sister and model Sekizawa Remi. During the party, while the restaurant lights have been turned off for a slideshow, hair and makeup artist Hanasaki Mizutoshi, who had been hitting on the Sekizawa sisters, can be heard groaning in pain. When the lights come on, Hanasaki's dead body is on the floor. Furthermore, the words "divine punishment" have been written on his forehead... Meanwhile, Sera recalls the day her mother Mary was turned into a child.

Okino Yoko comes to the detective agency, and Wakita Kanenori and Conan end up having to solve the case she describes that happened at a certain villa. The people present at the villa during the case had all kinds of relationships with the woman who went missing two years ago, giving all of them possible motives for killing the murder victim in the case. While attempting to solve the case based on things Yoko found strange, Conan receives a message from Kogoro, who is in the bathroom...?