Books like assasination classroom

Assassination Classroom (Japanese: 暗殺教室, Hepburn: Ansatsu Kyōshitsu) is a Japanese comic science fiction manga series written and illustrated by Yūsei Matsui. The series was serialized on Shueisha's Weekly Shōnen Jump magazine from July 2012 to March 2016 and is licensed in English by Viz Media. The series follows the daily lives of an extremely powerful octopus-like creature working as a junior high homeroom teacher, and his students dedicated to the task of assassinating him to prevent Earth from being destroyed. The students are considered “misfits” in their school and are taught in a separate building, the class he teaches is called 3-E. As of July 2016, twenty-one tankōbon volumes have been released in Japan with a circulation of 20 million copies.