One-Punch Man
Plot
On a supercontinent ravaged by monstrous threats, the Hero Association mobilizes superheroes to defend humanity. Among them stands Saitama, an unaffiliated hero from City Z whose rigorous training regimen granted him invincible strength—capable of ending any battle with a single punch. This absolute power has left him disillusioned, longing for an opponent who can reignite his passion for combat. His solitary existence changes when he encounters Genos, a cybernetic warrior seeking vengeance against the machine that annihilated his hometown. After witnessing Saitama effortlessly defeat the monstrous Mosquito Girl—an adversary who had nearly killed him—Genos becomes his devoted disciple.
Plot
The Hero Association's ranking system soon exposes its superficial nature. Despite his godlike abilities, Saitama's poor written exam results relegate him to C-Class, while Genos immediately attains the elite S-Class designation. When Saitama single-handedly stops an asteroid impact and later defeats the amphibious terror Deep Sea King, public opinion turns against other superheroes for their comparative weakness. In characteristic selflessness, Saitama deliberately draws criticism onto himself to protect his peers' reputations.
Plot
Simultaneously, the emergence of Garo, the self-styled "Hero Hunter", coincides with escalating monster attacks. A disgraced martial artist scarred by childhood bullying, Garo develops pathological hatred for hero culture. His violent campaign intersects with the Monster Association's schemes—a subterranean organization transforming humans into monsters. When they kidnap a Hero Association executive's son, Garo forms an unlikely bond with Tareo, a hero-worshipping child, before both are captured.