Chapter 173

As the smoke lifts, the students recoil at the sight of Korosensei, worn down and coated in ash. Yanagisawa again sics the Reaper on the class, and their teacher throws himself into the path of every strike. Karasuma has seen enough and levels a gun at Yanagisawa, only to be swatted aside. Before either Yanagisawa or a self-doubting Nagisa can brand the class as Korosensei's fatal vulnerability, Korosensei rejects the idea outright, honoring the students for gambling their lives on him and calling their love the finest gift imaginable, not a flaw but pupils he is duty-bound to guard.

Yanagisawa retorts that he and the Reaper will torture the whole class to death once Korosensei falls. To everyone's shock, the Reaper then evades a blade thrust from Kayano, who volunteers to occupy it so her teacher can recover. She confesses regret for having pushed the class to confront the truth and begs to atone by defending him, and Korosensei affirms that her choice let the class grasp what truly counts. Grinning, Yanagisawa orders her killed. Lunging in, Kayano is certain she can land the finishing blow, crediting the lesson to Korosensei and her sister, but the Reaper punches clean through her chest.

Yanagisawa cackles that both sisters have now perished before his eyes, adding he might have kept Kayano as her sister's stand-in were she not pierced through the middle. Consumed by rage, Korosensei quakes the ground and powers up, turning his tentacles black. The chapter sits between Students' Time and Facial Expressions Time.