Saitama is too powerful; so powerful that he eliminates all the fiercest monsters with a single punch. Discover the story of the most powerful superhero in this manga that will knock you out!! The battle of psychic powers between Psykos and Tatsumaki intensifies! After managing to save the heroes with Genos's help, Tatsumaki unleashes an enormous power capable of twisting the entire city... It is then that something changes in the hearts of the S-Class heroes watching the battle!