Sonoko takes Ran and Conan with her to cheer for her senior tennis player, Takao Goutou. Goutou collapses in the middle of the match due to poisoning and is rushed to the hospital. The ones who are suspected to have poisoned him are one of the two girls he is dating, and Sonoko who becomes the prime suspect when the poison is found on her glove. Conan tranquilizes her and reveals the culprit to be the captain of the tennis team, Fumihiro Azuma.

Conan, Mouri, and Ran are lost in the woods and arrive at a mansion where they are introduced it a fan club for Kira Miyahara, the heroine of a movie titled Blackmagic Girl who was supposedly killed in a car accident a year ago and whose body was never found. They are introduced to the club members: Kouji Yatsukawa, assistant director of Nichiuri TV; Reiki Hirasaka, the creator of the Blackmagic Girl series; Shouko Utakura the aspiring gravure idol; Yutaka Kani the president of Kira's fan club..

Hoonogi reveals that he discovered Hirasaka in his room dead. Kogoro breaks open the room and confirms Hirasaka died from drinking poisoned wine. The police arrive at the mansion where Kogoro shows them both locked rooms. In the séance room, Kogoro explains that the front door was padlocked from the inside and the only way out is through high window. The high window can only be opened with a switch in the room.

Conan investigates the two rooms one last time and brings Kogoro to the séance room and tranquilizes him. Conan reveals that after the culprit killed Hirasaka, he locked the room from the outside, and used one of the giant Kira posters to slide the key back into its drawer and close it before ripping it into pieces and throwing it into Hirasaka's room. As for the séance room murder, the culprit used the remaining posters, rolled them up, and taped them allowing them to support...

Sumiko Kobayashi is called to be a jury for a murder Tadashi Ishigaki. Toshio Iwamatsu, a burglar who broke into Ishigaki's home, is held accountable for the murder and Eri Kisaki is assigned as his attorney and Reiko Kujo acts as the prosecutor. Kogoro, Ran, and Conan attend the hearing where Ishigaki's housemaid and brother-in-law deliver their testimonies of discovering the body. Unable to find the murder weapon, the court ends without a decision and will resume the day after.

Due to the housemaid's behavior, Conan pressures the housemaid about the vase. That night, Kogoro and Conan ambush her in the middle of returning the vase to the crime scene. The next day, court resumes and Reiko presents the documents pertaining Ishigaki's burrowed money and the murder weapon found in a distant pound. Eri calls the maid up as a witness who explains she found the vase at a garbage collection point.

Kogoro appears in a commercial to promote white chocolate for White Day and is invited to a chocolate company's party. Kogoro, Ran, and Conan attend and are introduced to the company presidents, Taruto Urai and his wife Hoshie Urai. During the party, Taruto dies from cyanide poisoning. Inspector Megure and his Officers are called to investigate the death. The investigation leads Hoshie to be the prime suspect. As she is taken away to be searched, Hoshie trips and falls on a table causing many...

Conan investigates and upon discovering the method, tranquilizers Kogoro and explains how Hoshie committed the murder. He explains the burn marks on Hoshie's napkin indicate cyanide was on the napkin and the poison was placed on a lemon slice. Conan elaborates by explaining how Taruto was famously known to hate sour things and had planned to surprise his guest by eating sour food with the use of synsepalum dulcificum.

Heiji and Kazuha arrive at the Mori Detective agency revealing he was hired by a man named Shinichi Inubushi, one of the eight illegitimate children of the rich Tsunechika Inubushi. After Tsunechika's death, the health of his wife, Satomi, begins to fail and subsequently two of the illegitimate children are murdered. Believing the murderer is after the inheritance, Shinichi surrenders his share and takes up his mother's surname, Kudo, and has Heiji investigate the murders.

Mori takes Ran, Kazuha, Conan, and Heiji to the Inubushi household where they are introduced to the family. They learn about the legend passed down in the Inubushi family where their ancestor set his dog on fire after mistakenly assuming the dog killed his daughter while in reality, the dog saved his daughter. The ancestor was then killed in a house fire and the myth of the Inubushi curse was passed down.

Ran and Kazuha retreat inside the house and discover the inugami is gone. Conan and Heiji's investigation leads them to find conclusive evidence Saki's death was planned by the culprit. After hearing Ran and Kazuha's story, they realize the culprit is housing the inugami nearby and investigating an abandoned cabin. Inside the cabin yields evidence of a dog living there confirming their deduction. Nearby, Tomoaki Inubashi is pounced by the inugami and receives minor burns; an onion is found near