Volume 17

Bunretsu no jikan (分裂の時間) is the seventeenth volume of the Assassination Classroom manga.

Publisher's Summary
The class is divided: one half wants to carry on with the plan to assassinate Korosensei, while the other half wants to save him. So Korosensei splits them into two teams, led by Nagisa and Karma, and have them argue it out through an epic battle. The students of 3-E draw on everything they've learned so far to fight for or against Korosensei's life! Then to uphold their new unified goal, they need to infiltrate the International Space Station.