My name is Nagisa Shiota. By day I am a teacher at a junior high school but by night I am one of the best assassins in the business. It's been a while since I've had a target but now I've got a new job to complete. My latest target, my old best friend: Karma Akabane...

Have you ever wonder what happen after Korosensei death. Well here is a story about it. A story about Karma and Nagisa friendship and how they will interact if Nagisa was a girl after graduating from junior. There will also be some interaction between them with some of the class E students. Mainly fluff, but there will be some angst too. Fem!Nagisa au.