After committing to an intense training regimen for three years, the unassuming Saitama emerges with colossal strength, capable of vanquishing any foe with a single punch. Embracing his newfound power, he embarks on a quest to become a celebrated hero. Yet, the ease with which he dispatches villains leaves him disenchanted, yearning for a worthy adversary to reignite his passion for heroism. Enter Genos, a determined cyborg captivated by Saitama's unmatched abilities, who seeks to be his apprentice. Feeling overlooked and unrecognized, Saitama aims to elevate his status and decides to join the Hero Association through Genos. Together, they set out on a journey to prove themselves, craving challenging foes and the admiration of the public as they strive to carve their place as true heroes.