Our Territory

File 845 of Detective Conan (Case Closed) manga.

Long summary
Takeki Shōtoku has been found dead in the box after it was opened during a show. Conan rushed towards the stage which Ran was trying to stop him which Sera stops her by telling Ran that it is now her and Conan's territory. They are investigating the case which it still troubles Conan that he and Sera met somewhere. When Conan is about to ask Sera, he sees that when Sera smiles, a double tooth comes out, which Conan definitely wonders that he and Sera probably met somewhere.