Shinran Fanfiction: An Unassailable Love

Shinichi Kudo, a high school detective known as the "Savior of the Japanese Police" and the "Holmes of the Heisei Era," is out at an amusement park with his childhood friend and girlfriend, Ran Mouri, when he spots two suspicious men in black. Shinichi follows them to a deal, but while he is distracted, another man in black sneaks up behind him, knocks him out, and forces him to swallow a mysterious poison called APTX-4869, intended to kill him and cover their tracks. But due to a side effect, his body reverts to that of a child. Realizing that if the men in black find out he is still alive, his friends and family could be put in danger, Shinichi takes the name "Conan Edogawa" and moves in with Ran's family, hoping to use her father, Kogoro Mouri, to track down the men in black. Unfortunately, Kogoro is not only no help, but also a careless, bumbling detective. So whenever a case comes up, Conan uses a watch-shaped tranquilizer gun invented by Dr. Agasa to put Kogoro to sleep, then imitates his voice with a bow-tie voice changer to solve the case. Along the way, he solves many cases and makes many friends, all while searching for the members of the Black Organization, hoping to bring them to justice one day and return to his original form.