"My Hero Academia" is set in a world where superpowers, known as "Quirks," have become commonplace, with nearly 80% of the population possessing unique abilities. The story centers on Izuku Midoriya, a Quirkless boy who dreams of becoming a hero despite his lack of powers. His life changes when he encounters All Might, the world's greatest hero, who recognizes Midoriya's potential and passes on his Quirk, "One For All," a power that accumulates strength through generations of users. Midoriya enrolls in U.A. High School, a prestigious academy for aspiring heroes, where he trains alongside classmates to master their Quirks and face real-world threats.

The narrative explores Midoriya's journey as he learns to control One For All, balancing its immense power with his inexperience. Key characters include Katsuki Bakugo, Midoriya's fiery and competitive childhood friend with explosive abilities, and Shoto Todoroki, a prodigy with dual ice and fire powers stemming from a complex family history. The series also delves into the lives of other students, such as Ochaco Uraraka, who manipulates gravity, and Tenya Iida, a speed-focused hero-in-training. The faculty, led by the enigmatic Eraser Head and the imposing All Might, guide the students through rigorous training and moral dilemmas.

The plot is driven by the conflict between heroes and villains, particularly the League of Villains, a group led by the enigmatic Tomura Shigaraki and his mentor, All For One, a powerful antagonist with the ability to steal and transfer Quirks. As Midoriya and his peers grow stronger, they face increasingly dangerous threats, including Nomu, bioengineered superhumans, and the ideological clash between heroism and villainy. The series balances intense action with character development, exploring themes of perseverance, legacy, and the societal implications of Quirks. Through its episodic structure and overarching arcs, "My Hero Academia" presents a dynamic and evolving world where the line between hero and villain is often blurred.