Inori Hiyori

Inori Hiyori a ,young teenager is transferred to class 3-E to kill the one yellow octopus himself Koro-Sensei.But she is one of the most darkest past and she lives with her brother who is an assassin. But their is a secret her brother kept from her. What is it? Will he tell her? And will she be able to stay in class 3-E or will her past consume her? Find out!