When he opened his mouth , Yumi shot him with a gun .
Conan reveals that Yumi Yamamoto 's dentist assistant and deduces Yumi entered Yamamoto 's apartment and offered to treat him .
When Conan opened Conan 's mouth Yumi Yumi shot him with a gun .
Conan reveals that Yumi Yamamoto 's dentist assistant and deduces Yumi entered Yamamoto 's apartment and offered to treat him .