While driving home, Kogoro, Ran, and Conan witness a traffic collision between a green car and a red car. The man in the red car, Shun Hayami, dies from the collision due to his car catching fire. While the police interrogate Seiji Kurumatani, the man in the green car, he claims that he did not see the car at the intersection which caused the accident. Conan, suspecting a murder, mentions that they saw the two cars at a convenience store and the police question the store's owner to confirm this. The store owner tells them that he saw Hayami and Kurumatani arguing in front of his store. Conan confirms it is a murder and investigates the ashtray of the green car and finds the same cigarette brand as the one Hayami smoked. After tranquilizing Kogoro, Conan announces that Kurumatani planned the murder. He reveals Kurumatani, who is an auto mechanic, was repairing Hayami's red car and was lending Hayami his green car during the time. After the repairs were finished, he called Hayami to the convenience store so they could trade cars. Before arriving there, Kurumatani adjusted a billboard at the intersection where the collision would soon occur. The adjustment caused the billboard to reflect headlamp lights creating glare for Hayami which caused the accident. Kurumatani confesses to the murder and reveals that Hayami ran over his sister a year ago. When Hayami's car came into repairs, he knew Hayami was the murderer and began his plan for revenge.

Yamato and Euhara takes Kogoro, Ran, and Conan to a mansion. Euhara reveals that the man was owned by a rich man in the past; The man one day decided to search for five talented people and gave the five a room in the mansion until they have reached their dreams. Euhara reveals that five people, Shūsaku Akashi, Aoi Kobashi, Naoki Midorikawa, Shōji Yamabuki, Takuto Momose, and Shirō Naiko, refered to each others as colors that sound alike to their names. They were called Red (赤, Aka?), Blue (青, Ao?), Green (緑, Midori?), lit. Golden Yellow (山吹, Yamabuki?), and White (白, Shiro?) respectively. Yamato reveals that the doors in the mansion swung outward and that someone used a pile of boxes filled with books to trap Akashi inside a room. They examine the room to find one wall of the room painted red and in the center of the room a white and black chair placed back to back and nailed into the ground with the white chair facing the red wall. Yamato's rival, Takaaki Morofushi who's name can be read in Chinese as Koumei, arrives and reveals he was the first to find the body as he was delivering flowers to the late Aoi who died from a heart attack in the storage room of the house. Conan reveals that the culprit knew the door would open outwards in the house and the location of the boxes of books which means the culprit is one of the three people who use to live in the mansion.