After spending the summer break playing amateur entomologists with a girl, Nagisa, Sugino, and Maehara train with the greatest assassin of all, hoping to help their class launch the most sophisticated attack yet on their teacher Koro Sensei, an alien of extreme power, before he can make good on his promise to destroy a significant portion of the Earth. However, before their plan can be put into action, the students of 3-E fall under attack by a biological weapon.

Printed Manga-style; book opens from left to right. Pages are read from right to left. Translation of: Ansatsu kyoshitsu. Originally published: Tokyo : Shueisha Inc., 2012.