The battle for Koro Sensei's life against a multinational operation's soldiers and weaponry is difficult enough, but now his creator, mad scientist Yanagisawa, and and his former protegé, Grim Reaper II, join the battle to destroy him -- and they've both had major enhancements. But the stakes abruptly change when a 3-E student is fatally caught in the crossfire. If there's one thing that enrages 3-E's teacher, it's harming, let alone killing, his students. Koro Sensei's fury and ingenuity know no bounds, even as fate inexorably catches up to him.