Koroshiya Korogane has been an assassin since she was 14 it may not have been long but she has been training since she was 4. When she was 1 she was abandoned by her biological parents and was taken in by the assassin known as "The Reaper" now known as Koro Sensei, he may not have been her real father but he was the closest thing she had. (Disclaimer I do not own the Assassination Classroom Characters all rights for the Characters go to the creator)