暗殺教室 21 [Ansatsu Kyōshitsu 21]

The final volume follows Class 3-E after the main conflict has already been resolved, showing graduation, the students’ next steps, and the emotional goodbye to their teacher. It also revisits the group after a time skip to show how their lives have changed.

Alongside the ending material, the volume includes extra chapters set during winter break that focus on Koro Sensei away from the classroom. These stories show more of his personality and his interactions beyond the main school setting.

The book also adds a separate one-shot from before the main series, offering a very different story and a glimpse of the author’s earlier ideas. Together, the volume functions as a coda, combining closure, extras, and bonus material around the series’ ending.