My Hero Academia: Complete Lore My Hero Academia takes place in a world where approximately 80% of humanity possesses supernatural abilities called Quirks. These powers transformed society, creating professional heroes, villain organizations, and government agencies regulating Quirk usage. Japan's greatest hero, All Might, became the Symbol of Peace, while U.A. High School trains the next generation. Origins: Quirks first appeared with the birth of a glowing baby. As powers spread, society descended into chaos. All For One, a powerful villain capable of stealing and transferring Quirks, established control over others. His younger brother Yoichi possessed a power-transfer ability that merged with a stockpiling Quirk, creating One For All. Passed between successors, One For All became the primary force opposing All For One. Izuku Midoriya: Born Quirkless, Izuku dreams of becoming a hero despite constant discrimination and bullying from his childhood friend Katsuki Bakugo. After demonstrating extraordinary courage, he earns All Might's respect and inherits One For All. Entering U.A. High School, Izuku trains to control its overwhelming strength while learning the responsibilities of heroism. Class 1-A: Led by their strict homeroom teacher Shota Aizawa, Class 1-A includes explosive Katsuki Bakugo, reserved Shoto Todoroki, cheerful Ochaco Uraraka, disciplined Tenya Iida, compassionate Tsuyu Asui, energetic Eijiro Kirishima, intelligent Momo Yaoyorozu, and other aspiring heroes. Their experiences transform them from inexperienced students into capable fighters. Season 1: Izuku enters U.A. and begins developing One For All. The League of Villains, led by Tomura Shigaraki, attacks the USJ training facility. All Might defeats their powerful Nomu, but the attack reveals an organized threat against hero society. Seasons 2–3: The U.A. Sports Festival exposes rivalries and personal struggles. Shoto confronts his abusive upbringing under Endeavor, while Izuku challenges his beliefs about heroism. The Hero Killer Stain inspires growing villain movements. Later, the League kidnaps Bakugo, triggering a rescue operation. All Might battles All For One in Kamino, defeating him but exhausting his remaining power and retiring. Season 4: Izuku interns under Sir Nighteye and encounters Overhaul, leader of the Shie Hassaikai. Overhaul exploits a young girl named Eri for her Rewind Quirk. Izuku and his allies rescue her, although Nighteye dies. Endeavor subsequently becomes Japan's Number One Hero and battles a powerful High-End Nomu. Seasons 5–6: The League of Villains expands its influence. Shigaraki learns more about his traumatic childhood and becomes leader of the Paranormal Liberation Front. Meanwhile, Izuku discovers additional Quirks belonging to previous One For All users. The Paranormal Liberation War devastates Japan. Heroes battle Shigaraki, Gigantomachia, and thousands of villains. Numerous heroes die, society loses faith in its protectors, and widespread destruction leaves civilians vulnerable. Dabi reveals himself as Toya Todoroki, Endeavor's presumed-dead eldest son. Dark Hero Arc: Izuku leaves U.A. to protect his classmates while hunting All For One. Exhausted and isolated, he nearly destroys himself through constant fighting. Class 1-A eventually convinces him to return, demonstrating that heroes also need saving. Final War: Japan's remaining heroes unite against All For One, Shigaraki, Dabi, and their allies. Bakugo undergoes a near-fatal battle, Shoto confronts Toya, and Uraraka attempts to reach Himiko Toga emotionally. All Might fights despite lacking his Quirk. Izuku confronts Shigaraki, discovering the suffering beneath his hatred. He sacrifices One For All in an attempt to reach him. Shigaraki and All For One are ultimately defeated, but Izuku eventually becomes Quirkless again. Epilogue: Eight years later, Class 1-A has become a generation of professional heroes. Izuku works as a U.A. teacher until his friends help provide an advanced support suit, allowing him to resume hero work. Legacy: My Hero Academia explores discrimination, inherited trauma, corruption, sacrifice, and the flaws within hero society. Its central message challenges the belief that heroism belongs only to the powerful. Being a hero is not determined by rankings, fame, or extraordinary abilities, but by the willingness to reach out and save someone.