Tezuka Kunihiro and Conan are fictional characters, so there is no way to write a doujin novel about them. However, if you like Conan and Net King, you can try writing a novel with them as the background. Writing required inspiration, so he could start with character setting, plot design, background setting, and other aspects before gradually perfecting the content of the novel. I hope that I can successfully create a wonderful Doujin novel!