Depressed Child Oc X Assassination Classroom

The oc didn't like living, she did anything to numb down the pain. In the end she while, ended it, only to come back to life. Knowing that this will be the result of death, she had given up and decided to just suffer though it. Having a sleepy mind, accidentally entering a edvance children program. Where you can go to higher grades determined by the system. She ended up in highschool but because of smoking, doing drugs, fighting, barley trying in school. She ended up in class 3-E.

-disclamers-
Depression and the things that come along
I do not understand the Japan system or most of how it works so I'll be asking Google for information.
Child's like 3, died around age 19. Gets bored easily obviously distracted by anything. And just doesn't wanna live.