In a certain year and month in the future, Kudo Shinichi and Mao Lilan gave birth to a daughter: Kudo Kukuna.
Kukuna wanted to play some pranks while Dr. Agasa was not at home, but she accidentally found a photo of a strange boy who was very similar to his father. He had the same glasses and the same half-moon eyes. He looked like he was carved out of the same mold as his father...
When he walked into the basement and wanted to check the boy's information, the instrument suddenly exploded, killing Kukuna in a sea of fire.
When I woke up again, I went back more than ten years ago and accidentally met the boy "Edogawa Conan".