One day, a woman named Chiyome Hesogakure with a child named Chinzō visits the Nohara family and claims that she is the real mother of Shinnosuke and takes him away…

After a sudden explosion at Edge of Ocean island in Tokyo, Tōru Amuro, codename Zero, begins to investigate. Meanwhile, private eye Kogorō is arrested as a suspect, so Conan Edogawa…