Everyone must be familiar with the anime Detective Conan: the genius girl Ai Haibara, who developed APTX-4869 at just eighteen, and Conan Edogawa, the shrunken form of Shinichi Kudo, the Sherlock Holmes of the Heisei era. Because of a war, they transmigrate to London at the end of the eighteenth century, arriving in this fog-shrouded city. They aren't the only ones here: the Black Organization, the Detective Boys, Kogoro Mori…
They have all come to this era. Here, they will encounter Sherlock Holmes, Jack the Ripper, Professor Moriarty, Watson, and more, including matters involving the British royal family.