Summary
Beginning: Saitama develops supernatural strength after intense training and starts fighting street threats, defeating early enemies like Vaccine Man. Meeting and alliance: a cyborg seeks Saitama; together, they begin to act as a duo, and Saitama registers with the Hero Association, being classified in category C due to his registration photo. Examination and initial missions: Saitama participates in the Association's exam and carries out several lower-scale missions while the organization structures the class and dispatch system. House of Evolution: confrontations against a laboratory that creates monsters and experimental creatures, including intense battles that test the institutional response capacity. Recurring conflicts: clashes with the assassin ninja Speed-o'-Sound Sonic and other recurring adversaries, marking personal confrontations and chases. Deep Sea King: mobilization of multiple heroes to face a maritime threat that causes great destruction; Saitama intervenes and defeats the enemy in a decisive battle. Boros invasion: arrival of a fleet and powerful alien invader, culminating in a large-scale battle where Saitama faces and defeats Boros. Emergence of Garou, the "Hero Hunter": a fighter who initiates a campaign against professional heroes, defeating several of them and drawing the attention of institutions. Rise of the Monster Association: monstrous organization grows in influence, promoting abductions and large-scale confrontations between heroes and monsters; the escalating crisis elevates the institutional conflict and involves protagonists in more complex battles.
