Saiki somehow gets wrapped up in becoming a teacher for assassins, where they all have to kill their other teacher, Koro-sensei. This is inspired by ChikaShane's fanfic oneshots, please check her out and I recommend reading the assassination story she made. It's really impressive!

{y/n} ever since she was 5 wanted to be a history teacher because of her love for museums and history. After she turned 20 on her birthday she got a job as a night guard at her dream museum thats she always wanted to work at . But the all the former night guards quit or went mad after a week into the job but she was naive can she break the glass or can keep her in the frame forever.

In which you are a different person in every story. alter ego /ˌɒltər ˈiːɡəʊ,ˌɔːltər ˈiːɡəʊ/ noun a person's secondary or alternative personality. "in the flesh she is a million miles from her photographic alter ego"