The Scarlet School Trip (Bright Red Arc) Haibara decides to give Conan the APTX 4869 antidote for his school trip under the conditions that he wait 8 hours between doses, have a plan so people don't notice him changing back into Conan, and to not stand out as Kudo Shinichi. On the trip, Shinichi runs into Kurachi Keiko, an actress who knows his mother, and she invites him to help her solve a cipher. Shinichi and the others meet the film crew who are there with Kurachi working on a film about a tengu - the actor Ihaya Shinya, the director Mayama Mineto, and the composer Agata Riki. The scriptwriter, Nishiki, got the cipher in the mail and they find out the cipher's creator, Dekuri, committed suicide recently. Shinichi and the others leave to work on the cipher while the film crew goes to dinner, but Shinichi soon receives a text from Kurachi and they come back to find Nishiki murdered in his room alone with another cipher that the murderer left...