Sensei! Bokutachi ga Sekai wo Horoboshimasu.

A teacher has the sacred job of protecting and guiding students.

In this world where people who can use magic and people who cannot use magic coexist, Solo is a sorcerer who lives alone. He is also known as No. 0, a skilled assassin who always completes any request he receives. As part of a certain mission, he’s assigned to teach Class 2D at a magic school, the teenage students of which are dropouts. While he is desperately playing the role of a teacher in order to complete his mission, a transfer student arrives and the situation takes an unexpected turn…