Chapter 1: Old World

Shiro has a superhuman intelligence that is the most dangerous assassin in her world. She died and reincarnated into the world of Detective Conan/Cased Closed as Shinichi Kudo's older sister.

Follow Shiro's adventure into the Detective Conan world as she helps her brother take down the Black Organization with the help of her past life skills.

This will be femslash so if you don't like it then it's not for you.

Vermouth/Shiro