Let Live Time

After taking one blast, Korosensei answers the remaining problems instantly and unharmed, explaining that as a teacher he has already worked through every such workbook in the country. He upholds his side of the wager, then gently asks whether Asano's life is passing before his eyes. The Chairman remembers his beginnings, running a mountain cram school funded by stock market gains and raising three first students, Ikeda, Mori, and Nakai, who gifted him a golden oak leaf pin in thanks.

His faith in nurturing good students shatters when Ikeda, driven to despair by relentless bullying, takes his own life. Asano rebuilds his philosophy around strength and sacrifice, perfecting brainwashing techniques, ruining the bullies through gambling addiction, and founding the school that becomes Kunugigaoka. When his turn comes to open his own grenade rigged book, the blast is smothered by a layer of skin Korosensei had shed to shield him.

Korosensei reveals he modeled his own teaching on Asano's earlier, gentler years, and that by shunting his failures into another educator's care the Chairman had unknowingly kept those old methods alive. Asano refuses to concede defeat outright, granting only that the result proves his system functions, and he asks permission to return and try killing Korosensei another day. Walking back to his son, he vows to grow as both teacher and father, even inviting Gakushu to sue him for the earlier blow.

As a reward for the class's exam triumph, Korosensei discloses another weakness: his body favors speed over power, so pinning him in place would trap him, though he admits no student is fast enough to hold his tentacles. Soon after, Isogai relays that Class 3-E must stage a school play despite looming entrance exams, and Hazama writes a deliberately grim divorce story to spoil the whole school's appetite.

The flashback recasts the Chairman as a wounded idealist rather than a simple tyrant, his cruelty rooted in a loss he never processed. In the manga Korosensei and the students repair the wrecked classroom together, whereas the anime hands the rebuild to the Ministry of Defense. The closing beat, with Asano sensing a coming storm over Class 3-E, foreshadows Kayano's revelation.