Detective Conan - Season 31

Satomi attempts to leave her room and collapses; she is found holding onto broken Buddhist prayer beads with a black bead four down from the top. Later that night, they discover a letter signed by Miyuki confessing to the crime and are at the abandoned cabin. Conan and co-head there and discover the cabin covered in gasoline and the inugami running towards it. Conan catches the inugami revealing the fire effect created by imitation fire clothing with remote-controlled lights.

The Detective Boys are stranded on a mountain when Agasa's car breaks down. Seeking shelter from the rain they come across a villa where piano music was heard and enter the house when their calls are unanswered. Inside, they explore and discover a diary on the table confessing to a plan of a kidnapping and murdering a boy; a blackout then occurs due to the storm. They find a small coffin planned for the murder and realize its empty and the possibility the boy is still alive.

Realizing the piano playing they hear is a recording, they enter the piano room. Conan notices the piano chair was set to a child's height and deduces where the boy is. He has the Detective Boys sing a song in the piano room and catches the boy watching them and befriends him. The boy, Keita Onoda, is a piano prodigy to which the kidnapper abducted to allow his daughter to win a piano competition.

Conan, Ran and Kogoro get invited to England by a wealthy woman. Upon arrival, Conan is approached by a boy who has been given a series of riddles and been told that someone will die if he fails to solve them.

Still working on the mysterious clues, Conan slips up and gives away too much during a phone call with Ran, resulting in her having doubts about their relationship.

With the creator of the riddles exposed, Conan, Ran and Kogoro continue solving them.

Time begins to run out as Conan discovers that the riddle creator has committed fatal bombings in the past and that he might pull off another if he isn't found and caught in time.

With the riddle creator's target location identified, Conan realizes that one of the intended victims is secretly sending a message for help.

With the bombing averted, Conan transforms into Shinichi again to reconnect with Ran.

During a game of hide and seek with the Detective Boys, Conan and Haibara become hostages in an extortion plot by two men who are holding another one of the hostages for ransom.

Mitsuhiko, Ayumi, and Genta hide in the lockers where the criminals confine their hostages. The criminals attempt to call the hostage's home for ransom but is answered by a young man. Concluding their plan to be a failure, they opt to set the building ablaze to hide the evidence. Conan communicates to the Detective Boys by tapping his detective badge, and orders them to call their cellphones to lure the criminals out of the room.

Kogoro attends his alma mater and takes Conan, Ran, and Sonoko with him. A university student named Sonsaku Tsujiei asks Ran if she could examine how realistic their corpse is and guides her along with Conan and Sonoko through a haunted house production hosted by Tsujiei and his three friends. Inside the set, Anna Tadami dies after convulsing on a table. The police conclude it to be a suicide after finding a cyanide capsule in her mouth and her past obsession with death.

Conan investigates the scene and deduces Tadami was already dead before they arrived in the room and that the culprit feigned her convulsion in order to fake the time of death. He tranquilizes Sonoko and explains his deductions to the police revealing the culprit went under the table and used his feet in place of Tadami's which caused the convulsion. He declares Tsujiei as the culprit, evidenced by Tsujiei's toe nails which were painted red to match Tadami's feet. Tsujiei confesses and...

After a botched heist to steal a medieval crown, Kaito has to sneak away from a date with Aoko, try to steal it again and then return back before she notices.

Kaito attends a party hosted by a visiting European princess after being challenged to steal her necklace by her and her trigger-happy bodyguard. Unfortunately, Aoko and her father, who becomes depressed when the bodyguard vows to catch Kid himself, are with him.