The First Book by Shui Chu Bi Hai

Youze is a model citizen in every way except that he's an amateur hitman. He'd planned to retire and quit the business, but on his way home, a banana peel and a truck working in perfect tandem ended his life. When he woke up, he realized that transmigration was real after all, and that a truck really was a ticket to the world of anime and manga. In an unknown space, he came to understand what had happened and met the author who had created him. After they talked, Youze was sent to the world of Detective Conan. (This book exists purely for my own enjoyment, so feel free to check it out if you like! Tomato Novel has so few Detective Conan stories, so I had to indulge myself!)