Assassination Classroom vol 20 back

The battle for Koro Sensei's life against a multinational operation's soldiers and weaponry is difficult enough, but now his creator and former protégé, mad scientist Yanagisawa and 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… For older teen audiences.