The Beginning

Alison Hightopp is a 19 year old, young rich girl with a long life respiratory illness and a famous assassin on the side known as the Scarlet Reaper but when she finally gets better, her father sends her to E Class at Kunugigaoka Junior High School to help the class Assassinate the teacher. But things go wrong and she falls I love with the target.

And after the tragedy that was Koro-Sensei's death, he reappears six years on March 13, 2022, on the ground in front of the old Class 3-E Building.