[This article will be published on V on April 2, 2022, and will be updated every 10,000 minutes] Reading tips: 1. The main character is Detective Conan, and there are 23 cosplayers. 22 of them are vests of literary characters in the if line (with a lot of private settings and gender changes), and 1 is a Ritsuka vest (*All 23 cosplayers were female before crossing). 2. They will not be exposed. Cosplayers have vest skills and will consciously or unconsciously maintain the vest state. Their own memories will be mixed with the vest memory and difficult to distinguish them, but they will not retain their original personality and thoughts after the personality fusion. 3. After cosplayers integrate into the world of Detective Conan as characters, they will have a lot of non-existent pasts.