Mu Qinran has a secret, she can live forever. Because the mysterious pill needs to continue to be developed, Mu Qinran needs to go to Japan and stay at a friend's house temporarily. She meets Conan who is following Kogoro Mori to handle the case, and also gets acquainted with the Young Detective Team. She discovers that Xiao Ai and Conan both took the pill and became like this. Conan and Xiao Ai also learned about the silver bullet, the predecessor of the pill, from her, and Conan gradually discovered her secret.
The CP is temporarily undecided. The heroine is a Chinese police officer and works as an undercover agent in a dark organization, codenamed Anisette.
The heroine has two friends. One is a girl from the Xia Mu family. She is a sinister person who grew up in China. She has a somewhat out-of-touch personality and is similar to a spiritual girl.
The other one works in a dark organization, codenamed Baijiu.
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