King Arc

The ninth arc of the series and the closing chapter of the Hero Association Saga turns its attention to King, a hero whose intimidating aura hides a timid gamer. It reveals how a string of misunderstandings, several tied to Saitama's unseen victories, cemented King as the planet's mightiest man, and it deepens the bond between the two as Saitama learns his secret.

The lizard creature Tongue Stretcher terrorizes a street until King strolls in and, doing nothing but stare, cows the monster into surrender through the ominous thrum of his King Engine. Moments later a machine called G4, built by the Organization, singles King out as its target and threatens to butcher ten citizens a minute if he does not appear within ten minutes. Excusing himself to prepare, King instead breaks down in private, admitting he is a coward who was mislabeled the strongest hero after an unseen ally slew a monster before his closed eyes.

Unable to face the machine, King flees home to his games while Genos takes his place against G4, melting the robot from within only to face its concealed true form. Saitama, having slipped through King's open window, deduces that his host simply prefers gaming to fighting and is merely bored. A sudden Demon-level alert brings the Giant Crow smashing into King's building, and Saitama halts the beast one-handed as King cowers behind him.

With the crisis over, a tearful King confesses the whole fraud to Saitama, realizing that the hero beside him is the very person whose feats he had unknowingly claimed. Saitama, entirely indifferent to the revelation, keeps the secret and simply leaves. Genos, meanwhile, finishes off G4 and salvages its remains for yet another upgrade.