One-Punch Man 13. Book 24-25. Technory. Unknown power. One

The heroes of the class S, with the support of their association comrades, continue to fight the monsters. They rescued the capriczul from captivity, but it turned out that another child had perished underground. While the rescuers decided who would return for the boy, Saitama wandered around the den in search of a noise source and, without knowing it, crushed the lord of all the monsters - the king of the snake! And at the depths of the dungeon, meanwhile, Haro came to the mind, who declared hunting for the heroes...

The book included chapters 119–131, as well as bonus.