It's time for second term, and the assassination classroom is ready for a semester filled with intense training, studying, and new ways to kill their teacher. But even their most creative plans are falling flatter than a two-ton pudding. That is, until a powerful student decides to come back to class! Koro Sensei's days may finally be numbered.

As their skills grow, so does their confidence. But will this lead to a successful assassination or reckless missteps that land them in trouble? They'll have to keep their attitudes in check because a dangerous lesson with the Reaper awaits them. Not to mention clashing against A Class in another harsh round of midterms!

Through it all, they'll have to face a question more challenging than any final exam-do they save the world or save the world's greatest teacher?