An old lady was pushed down the stone steps of a temple in Yonehana-cho. She says that a young woman down pushed her, but there is no other information. Among the onlookers, she spots a man staring at the old woman. She calls out to him, but he acts suspiciously and leaves the scene, saying he knows nothing about it. Apparently, he had seen the crime scene, but has a reason he cannot tell. Conan and the Detective Boys split into two groups and begin investigating the man. Conan and Haibara learn from a waitress at a coffee shop that he is a man named Kanieda who lives in the town of Shikabane. The town is more than an hour away and they have never been to the coffee shop before, but the waitress remembers a phone call to the coffee shop that was addressed to Kanieida and how he looked at that time. Conan and the others attempt to contact Kanieida, who entrusted them with a lighter that he had left behind at the time.

Furuya, Date, Matsuda, and Morobushi are gathered at a party. Date has a girlfriend, but Hagiwara offers to pay for her drinks, so she joins the party as a headcount. Then Hagiwara arrives late, saying that he was late because he was helping his grandmother on the way to the party. The second party is to go to a karaoke bar, but by then Hagiwara is on his own. The next day, while the five of them are cleaning up, an "RX-7FD3S" enters the police academy. Emerging from the car was instructor Onizuka. Hagiwara, who was extremely interested in the car, made an enthusiastic speech that overwhelmed the Onizuka instructor. However, this is not Onizuka's car, but the beloved car of a senior detective who died in the line of duty. The senior detective's daughter is aspiring to become a detective and is keeping it with her until then. During the heavy equipment training that followed, the topic of conversation turned to Hagiwara's condition earlier. Hagiwara's family had a car repair shop, so he was apparently familiar with cars. Their childhood friend, Matsuda, had also been in the Hagiwara family factory, and they were good at tinkering with machinery. Hagiwara said, "I really wanted to take over the factory, but as soon as the business was going well and they added more stores, the economy took a turn for the worse and the factory went under. In contrast, the police never go bankrupt," he says, which is why he decided to become a police officer.

Conan and the Detective Boys come to the apartment of Aoki Keiji, an acquaintance of Mitsuhiko. Aoki is making figures with his college club mates Nao Mizuhara, Kazuya Shiraishi, and Saki Midoriyama, and had promised to show them the figures. While Conan and the others are amazed and curious about what is in the room, Shiraishi is not happy. Shiraishi says, "My future depends on it," and seems to be obsessed with the contest in which he plans to submit the figure he is currently working on. Originally, these five members, plus Yuri Kurose, were the circle's friends. Yuri is deceased, and it was her dream to win a prize in the contest she is participating in this time. While the other members were making plans to visit her grave with the figure on the anniversary of her death, the day of the first screening, Shiraishi left the room, spitting out insults to Yuri such as "No matter how much sense you have, it is meaningless if you are dead.

　Ran, Sonoko, and Sera are invited to a birthday party by their classmate Yumi Sekizawa. Yumi was born on February 16, and her sister, model Reimi Sekizawa, was born on February 15, so the party was a celebration for them. The venue was small but full of celebrities, including models, actors, and TV personalities. There were also Reimi's manager, Kushiyama, Reimi's classmate, Hatsune Tsuguo, a pastry chef, and Hanasaki Mizutoshi, a hair and makeup artist.

A client comes to the Mori Detective Agency asking for help, "My girlfriend has been kidnapped by a red sheep! A client comes to the Mori Detective Agency asking for help. His name is Ryota Beppu. The kidnapped girl is Ami Takigawa, his girlfriend who works with him at a restaurant called "La Mucho". Beppu is threatened: "If you want Ami returned safely, come to Yonehana Park tonight at 12:00 pm by yourself, and do not inform the police. As Conan and Ran looked on, they thought to themselves, "I feel like I've seen this somewhere before. Kogoro and Beppu head to the designated park in the middle of the night and meet Ami, who does not appear to have been kidnapped. They learn that the truth behind the kidnapping is a "red sheep game" that tests the courage and affection of boyfriends and that it is currently popular on SNS.

While Kogoro is swept up in the investigation of a fake kidnapping case in the "Red Sheep Game" to test his boyfriend's courage and love, Conan and Ran encounter a red sheep in disguise on a night street. After the red sheep leaves, they find the body of Tetsuzaburo Wakabayashi, owner and head chef of the restaurant La Mucho. Conan and his friends, suspecting a connection, visit the restaurant because it is also the workplace of Ami Takigawa and her lover Ryota Beppu, who were involved in a fake kidnapping. There they meet sous-chef Kokichi Mukai, chef Daiki Kamio, and restaurant partner Motojiro Hirasawa. While asking about their alibis and other details, they come across a video of a red sheep escaping from a couple on a date about two weeks ago.

The body of Iwao Yamashita was found in an abandoned factory in Tokyo. Inspector Megure and his team arrive at the scene after receiving an anonymous tip-off, and from the condition of the body, they believe that this was not the place where he was murdered. Meanwhile, an officer from the local police department arrives at Yamashita's home after being unable to contact the family and discovers a safe with the door open in a dilapidated room, and a figurine with bloodstains and hairs lying on the floor.

Inspector Megure and his team confirm the scene and begin their investigation, assuming that this is the crime scene. Two days later, a person who has been persistently following the Yamashita department surfaces. When Inspector Megure hears the name of this person, Kyosuke Temukai, he becomes upset. About three years ago, he had spotted Temukata, who was working for the Tokyo Metropolitan Government at the time, in the investigation of a murder case. When asked about his alibi for the incident, he reluctantly revealed that it was a secret meeting with a certain businessman. Although his alibi for the murder was proven, Temukai lost his job when the government found out about his inappropriate relationship with a certain contractor. As a result, he is said to be harboring a recrimination against Inspector Megure. He is now in the publishing business, and it is said that he has a method of approaching socially successful people and having them write and self-publish their autobiographies. One of his targets was Yamashita.

Conan and Ran accompany Kogoro to the mansion where he has received a request. The client is Yuyama Morikawa, known as the don of the soft-serve ice cream industry. Yuyama has been diagnosed with cancer and has very little time left to live, and he asked Kogoro to advise him on his inheritance. In the mansion were the owner, Yuyama, three brothers, Yuichiro, Yujiro, and Yousaburo Morikawa, who were candidates for inheritance, Hiroki Oi, a lawyer, and Tomoyoshi Shikatsu, the chief butler. All the three brothers talk about is their inheritance. When Conan goes around the mansion, he sees that each of them is eager to get their hands on the inheritance. They fight constantly, and Tomoka, who has known them since he was a child, seems lonely. 　At dinner, Yujiro is nowhere to be found among the members gathered in the dining room. The meal begins without Yujiro's arrival, and after dinner, they are informed that the will will be rewritten tomorrow afternoon.

Conan, Ran, and Kogoro arrive at the residence of Yuyama Morikawa, the don of the soft-serve ice cream industry, at his request. Yuyama has cancer and does not have long to live, and he asks Kogoro to identify three brothers who are candidates for inheritance. There, the third son, Yuusaburo Morikawa, is found dead in a locked room. The second son, Yujiro Morikawa, who had been missing since the day before, was also found dead in a tank of soft-serve ice cream as a result of the search. "The next target will be me!" said Yuichiro Morikawa, the eldest son, who is distraught and hides in his room.

Conan was at Dr. Agasa's house with the members of the Detective Boys. They were watching a webcast psychic delivery of "Softie Sadao and Scaredy-cat Toshiko Visit Haunted Locations! Ayumi, Mitsuhiko, and Genta are fascinated by the video. Conan and Haibara are excited to go with them and say, "Let's go take pictures of ghosts at haunted places! Conan and Haibara accompany the excited three to an abandoned hospital.

Conan, Ayumi, Mitsuhiko, Genta, and Haibara were on their way to Hatoyama Farm by bus with their homeroom teacher Sumiko Kobayashi and assistant homeroom teacher Rumi Wakasa. They were to be given new chickens to take care of at school. Also on the bus were Junya Hizuka, Takashi Minami, and Shogo Kano, who were going to the same ranch for interviews and research. However, they seemed to be on bad terms. Ayumi and Mitsuhiko are interested in a video Kano was watching on his smartphone. Mitsuhiko took a picture of it with his own smartphone, and when he tried to find out more about Kano's work, he got into trouble. He was saved by a fellow passenger, Toru Amuro. Amuro also seemed to have something to do at the ranch, so he went to .......

Conan, Ayumi, Mitsuhiko, Genta, Haibara, homeroom teacher Sumiko Kobayashi, and assistant homeroom teacher Rumi Wakasa meet Amuro on the bus heading to Hatoyama Farm. Also on the bus were Junya Hizuka, Takashi Minami, and Shogo Kano, who seemed to have some purpose in mind. While Conan and his friends are spending time at the ranch, Kaisuke Hatoyama, who claims to be the rancher's brother, appears before them. Kaisuke takes Ayumi hostage, and Conan, Amuro, Mitsuhiko, and Kobayashi are locked in the basement of the office. There they find the body of the rancher, Gisuke Hatoyama, and Yuya Kazami.

Conan and Kogoro met Takayuki Katsuro, an accounting firm manager, his wife Sayaka Katsuro, and his secretary Ken Makinoura at the hospital. Takayuki had been diagnosed with only six months to live, but he seemed to be trying to live his remaining time to the fullest. A few days later, however, he is found murdered in his home. That morning, Sayaka and Makira went out to run an errand for Takayuki. When they returned home in the evening, they found Takayuki in the bathroom with his wrists slit. It seemed under the circumstances that he might have cut his own hand, but Sayaka and Maki-ura, as well as Conan and the others, believed that he was not the kind of person who would do such a thing because he was suffering from an illness. Then Takayuki's friend Yoji Kanda arrives. He had been contacted by Takayuki last night and told to come to his home. In that call, Takayuki mentioned that he was feeling resentful toward someone, and Kanda said that there must have been some kind of trouble.

Conan and Kogoro see a news report on TV that Daijiro Butsumaru, the victim of a traffic accident, has disappeared. A woman, Fusae Mori, who witnessed the accident while out for a walk, reports it to the police with Futsumaru's driver's license, but it seems that the assailant, Hajime Inukai, has gone missing, saying that he is taking Futsumaru to the hospital. Meanwhile, the Mori Detective Agency receives a phone call. It was from Futsumaru's wife, Shoko Futsumaru.

Kogoro sees Inspector Megure walking in front of Cafe Poirot. He congratulates him on speedily solving a recent case, but apparently it was a false arrest. Conan joins him, and the two ask Inspector Megure about the case. 　Shuhei Odawara, the landlord of a private house, is found dead. There were marks on his neck and head as if he had been strangled and beaten, respectively, and a rope and iron pipe were found at the scene. The police believe that "the murderer broke a windowpane, knocked him out, and strangled him to death with an iron pipe. Furthermore, according to the testimony of his girlfriend, Tomoko Yaguchi, her ex-boyfriend, Yosuke Kagetsu, emerged as the murderer.

Yoko Okino comes to the Mouri Detective Agency and talks about an incident that happened at a villa. Instead of Kogoro, who is holed up in the bathroom and does not come out, Kennori Wakita of Iroha Sushi and Conan are assigned to the case. Producer Wanya Fuejima of Nippei TV, who was at the villa with Yoko at the time, informs them of a sister, Baba Houka, who disappeared several years ago and is believed to be related to the case. Houka's husband, Baba Kankou, Kankou's younger brother, Baba Fugo, and his wife, Baba Himi, were childhood friends who had been together with Houka for a long time. Hoka was Kankou's wife, Fengo's first love, and Himi's best friend.

It was two summers ago that she disappeared. Each couple was supposed to go to the villa to join the others for a summer vacation, but Nankang had urgent business and Hoka was supposed to arrive at the villa alone first. However, when the remaining three arrived at the villa, she was nowhere to be found, and they called the police to search for her, but were unable to find her. If Nanko, who was to be murdered in this case, had anything to do with the disappearance, then everyone but Yoko would have a motive.

Morobushi runs up the stairs of his house, which is engulfed in flames, as Furuya, Hagiwara, Date, and Matsuda try to stop him--! The story goes back three hours earlier. The five had been caught by Onizuka, the instructor, and ordered to clean the bathtub. While they were cleaning the bathtub, they saw the information on the copier about the girl who was reported missing last night. Morobushi had seen the girl in town and had received a picture of her. The topic naturally came up during the cleaning, but Morobushi was reluctant to go into details, saying only that she looked just like a girl he used to play with as a child. Morobushi was afraid that someone else might get involved, but the four of them all said in unison, "We're not going to die!" Morobushi was encouraged by their words. Encouraged by this, Morobushi began to talk about an incident he had encountered in the past.

Conan, Haibara, Ayumi, Mitsuhiko, and Genta found an abandoned car on the riverbank. Although they complain about the insanity of the situation, rain is forecast for the evening, so the five of them decide to rush off to play. Conan and his friends begin to play soccer, but Genta almost hits a woman on a nearby bench. She is Tamaki Onda, a representative of a design company. She is fidgety and blurts out her voice into the voice recorder, but after talking to Genta, she shows them some spectacular lifting. They became good friends through soccer, which they used to play in college, but then they heard the sound of thunder as predicted. Conan and his friends leave Tamaki, who seems to be waiting for someone, and go back to their homes.

Conan, Ran, and Kogoro arrive at the Kusano Chicken Egg Factory. Hitoshi Namba, the national champion of firstborn chick identifiers, a.k.a. chick appraisers, came to Kogoro for advice, saying, "Strange things have been happening for the past few weeks. The contents were all strange: a rubbery cannonball flying at him while he was walking, a magnifying glass scorching his hand from a distance while he was dozing off, a smartphone exploding, and so on. Kogoro had no idea who was being targeted, so he was assigned to investigate the cause and to act as Namba's bodyguard. When he goes to talk to the people at the factory, Saburo Kusano, the president, says that he has the best track record and personality, and that it is unthinkable that anyone would target him, but his colleague Takashi Nakamura, a Hatsumei Hina identification specialist, replies with the implication that he has a good outward appearance .......

Conan, Ran and Sonoko arrive at the trendiest dating spot. They find an old woman, Hal Kamogawa, sitting on a bench with an anxious look on her face, and try to talk to her to see if she is lost. Then a man arrives. Conan and his friends think he is Hal's son from his appearance, but he, Joji Kazama, says he is her lover. Sonoko, seeing that Hal is a very wealthy woman, considers the possibility that Kazama, who is as old as her son, approached her for her money, and tries to give her some advice, but she is given the cold shoulder. When Sonoko gets angry and says, "I'm sure he's going to try to swindle you out of a lot of money for the sake of his daughter who has an incurable disease," Kazama turns sad and .......

A woman, Kae Nishiwaki, comes to the Mori Detective Agency where Conan and Kogoro are. She came to ask Kogoro for help, saying that someone had broken into her room while she was at work. The intruder, who appeared about a month ago, is not a burglar, but is said to leave gifts in the room. She came to Kogoro's office because she thought the police would not believe her story because of its strangeness. Conan and Kogoro arrive at Kae's apartment and find a trunk with a ribbon on the front door. Thinking it was a new present from the intruder, Kogoro opened it and found the body of Ryuko Kusakabe, bleeding from the head, stuffed inside. ......

Conan and Kogoro were attending the wedding of Shinpo Yokoyama and Sayoko Imamura. They met the groom's father, Mitsuteru Yokoyama, at Kogoro's favorite bar, and in the excitement of the occasion, they were invited to the wedding. At the venue were the wedding planner, Hiroko Nagashima, the pastor, Harutoshi Alex Kawasu , and other staff members, as well as Takehito Yamada, a close friend of Shinobu's, and Sayoko's friends. The wedding ceremony began, but just as Sayoko entered the chapel, she suddenly began to suffer and died. Sayoko's friend Naho Mizuguchi and other people in the hall say disturbing words such as, "Of course she suffered" and "She was cursed."

Conan, Haibara, Ayumi, Genta, and Mitsuhiko come to "Maxima's Pizza," a pizza shop specializing in take-out. They participate in a campaign to guess the size of the pizza dough, and thanks to Genta's efforts, they get a piece of pizza. The pizzas are divided into five equal portions, placed in a special box, and Conan and his friends head home. On their way home, someone steals all the pizzas!

The Mori Detective Agency receives a call from a client, Mayako Nagamine. Mayako was supposed to come to the office, but she seems to be lost. It was past the scheduled time, but Kogoro was thrilled, knowing that Mayako is a beautiful woman after checking her photo on Instagram. Mayako married Haruhiko Nagamine, her boss at work, a year ago. She is now a full-time housewife. Listening to the phone call, Conan assumed that he was supposed to investigate Haruhiko, who is constantly rumored to be having an affair. However, she was told that the request was to investigate Haruhiko's possible involvement in a crime. Mayako saw Haruhiko bring in a suitcase in the middle of the night and hide it in the garage. She tried to check inside, but was unable to open it because it was locked, and the fact that it was unnaturally heavy made her suspicious.

On a main street outside of town, Ayumi sees a man running frantically. The man has long hair, wears a red jumper, a mask and gloves. He is carrying a small black bag in his hand and runs straight into the premises of a large apartment complex. An elderly man, Shosaku Kume, appears from the same direction, shouting "Snatch and grab! and chased after the long-haired man. Ayumi hears from Kume that he has snatched a bag containing 300,000 yen that she had unloaded, and she calls Conan and the others. Conan and his team arrive at the apartment complex, and while they are listening to the story, a body is discovered inside the complex. The victim is Koichi Samura, a resident of Room 301 in Building B. Lying beside him was a red jumper and a small black bag. However, there was no 300,000 yen in the bag, and he did not have long hair like a purse snatcher. He also had one leg in a cast and did not appear to be able to run. Conan searches his room and discovers something.

Conan, Ran, and Kogoro come to Shimonoseki by way of an introduction from attorney Hiroki Oi, whom they met in a past inheritance case. The clients this time are Makoto Izumiya, the fourth generation owner of the long-established fugu restaurant "Izumiya," which has been in business for over 100 years, and his daughter Kaede Izumiya. They say that the burglar broke into their house during the busiest time of the day when the restaurant is busiest and there is no one in the house. Without paying attention to the money or goods, what the burglar stole from the safe was a pot. The pots and pans were all made by the same artist, and each of them could have cost several million dollars, but what was important to them was "the broth from the skin of the pot, which has soaked up the flavor of the pot since its establishment. The theft was a big blow to Izumiya, who was about to compete in the finals of a national event called "Tekchiri GP" in the near future.

While Furuya was getting ready in his room, Morofushi, who was about to leave, came to him. As they were talking, Matsuda joined them and they decided to go out to a convenience store. Hagiwara and Date greet them with a look of dismay as the three of them take it easy before an important ceremony. Today, the graduation ceremony of the police academy where Furuya, Matsuda, Hagiwara, Date, and Morofushi spent their time, was celebrated with many fond memories.