Shiratori has Kobayashi listen to the three suspect's voices and has determined none of them was the voice that shouted out and storms out of the police station. Haibara explains Kobayashi must have seen Sato and heard the rumors that Shiratori is only settling for Kobayashi in place of Sato. Shiratori attempts to rectify the misunderstanding and confronts Kobayashi revealing they met many years ago in a bookstore when confronting a pair of thieves.

Kobayashi enters the music room where the culprit proceeds to attack her. However, she manages to incapacitate the culprit with a suplex and is revealed to be Sato in disguise. The Detective Boys and Shiratori appear revealing Sato replaced Kobayashi in the hallway and named the culprit to be Ryuusuke Kodama. The Detective Boys reveal that Kobayashi's testimony was correct and that she mistook Kodama to be a woman in the alley due to his long hair and the position of his arm making...

Shiratori reveals that they questioned the truck driver who saw the victim and Kodama entering the alley. Kodama confesses and explains that Sumida planned to kill Kodama to receive money from his life insurance to settle his debt and murdered her in self defense. The next day Jirokichi Suzuki enlists the Detective Boys to defend the amber Kirin's horn from the Phantom Thief Kid. Kirin's horn is secured in the center pillar of a secluded shrine.

Jirokichi stakes the key into the wall and awaits for Kid's arrival. Kid causes a blackout and the timed explosives destroys the windows causing strong winds to rush inside the shrine. While the Detective Boys protect the pedestals, the center pillar is heard opening. When electricity is restored, they discover Kirin's horn is missing, Conan is knocked out by a taser, and cards signed by Kid are attached to all four pedestals.

The Detective Boys discover Conan is feigning to be in an unconscious state to deduce Kid's motive for stunning him. The Detective Boys inform Conan what occurred during the black out allowing him to deduce who Kid is disguised as. Conan has Haibara reveal to the adults that Kid manipulated the Detective Boys, unknowingly, into opening the center pillar by having them lean on the pedestals. Haibara explains that the Four Symbols each represent a season;

Kogoro, Ran, and Conan are invited to assist on a rooftop farm. Once there, they discover the elderly farmer, Takehiko Nakamura, dead from a head injury. The police are brought in and the other three farmers are interrogated for the death. Conan discovers a shattered brick with a hole and discerning how Nakamura was murdered, tranquilizes Kogoro and reveals the farmer Marie Inoue to be the murderer. Conan reveals that she hung a brick on the handrail and concealed it with a towel and lured ...

While Conan, Kogoro and Ran celebrate the birthday of Ran's mother, Eri, at a hotel, a client of Eri's is killed in her room while she takes a shower.

Ran discovers a receipt for a necklace in Kogoro's wallet and discerns that he is going to give it to Eri as a birthday present. Ran decides to enter a raffle draw to win a luxury hotel trip for her parents and succeeds in winning the tickets. Eri reschedules to meet her client at the hotel upon hearing about the supposed necklace. Her client, Akiho Koukuba, enters Eri's room after getting into a fight with her husband, Takehiko Koukuba, and falls asleep.

Agasa takes the Detective Boys to the house of a famous aquarium designer, Nishida. Kousuke Imura lets them into Nishida's home when Nishida does not answer the door. The Detective Boys find Nishida drowned in his bathtub. The police determine that Nishida died the night two days prior and from falling asleep in his bathtub due to alcohol consumption. Conan's disproves the theory explaining that the bathroom light was not on when they found him.

Kogoro and Conan are taken by Ran and Sonoko to a Rooster Festival. Ran and Sonoko sneak off to have their love fortunes predicted. Sonoko reads Ran's fortune which strongly suggests her to be feminine and avoid mannish conducts. Sonoko is then robbed by a man wearing a hyottoko mask who flees with her purse towards Ran. Ran, hesitant by her love fortune, does not incapacitate him with karate and allows him to escape.

It was discovered the button did not belong to any of the suspects. As Conan investigates, he is able to deduce Masuko's message when he realizes it is related to the Chinese zodiac and reveals to Kogoro that the culprit is Shinji Mizunoe. Conan explains that the ninth sign of the Chinese zodiac refers to Monkey and is written as shin (申, lit.) in Han.

Conan, Ran, and Kogoro arrive in Hiroshima to meet a film crew who plan to film them touring Miyajima, Hiroshima. The assistant producer, Yuuichi Kitamura, gets a severe stomach pain that causes him to be bedridden. They take a ferry to Miyajima and begin filming. In front of Itsukushima Shrine, a crew member finds out salt was added to his drink; the film crew then notice a familiar man in a crowd and assume him to be at fault.

Realizing only the wonder left is the dragon fire, the film crew decide to let Kogoro investigate in order to stop Shinroku before he attacks them again. As they learn more about Shinroku, the director is stabbed with a dragon-designed dagger and hospitalized as a result. That night at the hotel, the culprit attempts to sneak into a room and attack someone but is ambushed by the crew and police. They reveal they moved that person away and declare the culprit to be Yuuichi Kitamura.

Kogoro is called to meet with Toshio Higashiyama at his company building and takes Ran and Conan with him. Upon entering the building, they are asked to call his sectional number, 423. After getting in contact with him on the phone, they witness the employee Fujihiko Takahaka, fall from the building to his death. The police are called to the scene and enter Takahaka's office discovering a typed suicide note.

Agasa takes the Detective Boys with him to a sauna as he fixes his product. At the sauna, the kids are introduced to four cast members filming a drama about a hitman. Since the sauna is crowded, the kids decide to bathe in the early morning. As they head to the sauna, Ai and Ayumi discover the Ganji Tetsuyuma, the scriptwriter, dead. The police arrive and conclude that Tetsuyuma slipped on a bar of soap and hit his head on the rocks.

As the police continue their investigation, they discover a plastic tea bottle filled with water in the dressing room, match cinders floating on the water, and Tetsuyuma's silver-gemed ring. It is also revealed that all the suspects have been seen in the hotel after the sauna was closed disproving their previous theory. Conan uses his voice changing bowtie to impersonate Agasa to reveal the one waiting on the veranda was the victim and the Tetsuyuma spotted heading to the sauna...

Conan and Ran are on a train and are confronted by a pickpocket but are saved by an elderly man named Tokuma Norizuki. As the train passes Sugamo Station, they notice the police investigating something under the railway. Conan and Ran discover that a man named Kanemura, a local con artist, was killed by a head injury. Norizuki claims he witnessed Kanemura's boss, Takehiko Kiriya, committed the murder.

Kogoro receives a request from a letter by Mika Tatezato to investigate the murder that occurred at an inn eleven years ago. On the way, they pick up a teacher named Rokurou Tokobi who requests for them to stop by a grave site before heading to the inn. Tokobi explains that Tatsuhiko Numayama, a student of his, drowned in the river by the inn which is owned by Tatsuhiko's father, Banzou Numayama.

As Conan investigates, he realizes how the culprit was able to drown Bonzou with swamp water in his own attic. Conan tranquilizes Yamamura and reveals the murderer to be Tokobi. Conan explains combining the water bottle and the paint bottles would be able to carry enough swamp water to commit the crime; The water was then poured into a basin where Bonzou was suffocated in. This is evidenced by the diluted paint that are currently in the containers.