Shiho Miyano, a scientist from the Black Organization, develops the Apotoxin 4869, a drug that turns Shinichi Kudo into a child. When Shiho learns of her sister's murder by the Organization, she defects, taking the drug herself. Now, as Ai Haibara, she must evade her pursuers. This spin-off features beloved episodes such as "Reunion with the Black Organization", "The Mysterious Passenger", and "The Jet-Black Mystery Train", leading to a nail-biting climax. Will Ai Haibara survive the explosive confrontation? Find out in this thrilling saga, continuing to "The Black Iron Submarine".