Despite getting hit by the first BB-filled book, Koro-sensei manages to finish the other textbooks without setting them off, having memorized all the problems beforehand. Left with the final textbook containing the real grenade, Gakuhō recalls how he used to be a kind-hearted teacher who held a private cram school for elementary school students. Three years after his first class had moved onto middle school, Gakuhō was shocked to discover that one of his students, Ikeda, had committed suicide as a result of bullying. This led Gakuhō to change his approach of teaching from raising good students with kindness to raising strong students with ruthless tactics. Back in the present, Koro-sensei protects Gakuhō from the grenade, revealing he based his teaching methods on Gakuhō's old stance on education, which he believes has been carried on into E Class. Reflecting on this, Gakuhō allows E Class to continue and aims to become a better educator and parent. Afterwards, E Class put on a play for the school's drama festival, giving their own unique take on Momotaro.