Chapter 175

Trading blows with the mangled Reaper 2.0 high in the air, Korosensei drifts into a memory. Long ago, the original Reaper spotted a vase of flowers and asked their origin; the boy explained he had gathered them to rehearse consoling people during assassinations, offering to take them away if unwanted. The Reaper let him keep the blossoms, praising the child's taste as finer than his own, then told the beaming boy to study more chemistry.

Slipping past Reaper 2.0's strike, Korosensei wonders whether he could have steered his student toward a kinder path, then deals him a fatal wound with an anti-sensei blade. In his final breath, the Reaper reveals that when the tentacles asked what he wished to become, he answered that he longed for recognition, to be like his mentor. Korosensei says he understands the feeling and invites him to keep studying together in the next world before sending him into the barrier.

No one celebrates the Reaper's disintegration, as the class still grieves for Kayano. Korosensei admits to a lifetime of errors while insisting the past can be learned from, then produces a red sphere of liquid, every bit of blood Kayano lost when she was impaled. Rejoining her blood cells, he explains he prepared for exactly this so history would not repeat the death of Aguri Yukimura. With extra blood donated by Itona and Karma and a small jolt of electricity, Kayano is brought back to life.

The Japanese title reads Modoranai Jikan, and the chapter is positioned between Facial Expressions Time and Time Has Come. As the students celebrate Kayano's return, Korosensei privately asks Aguri whether he did a good job as their teacher.