Long before All Might became the Symbol of Peace and Hero Rankings turned pro heroes into celebrities, Japan stood on the brink of collapse. Villains ruled entire districts. Governments struggled to maintain order. Heroes were few, and those willing to stand between humanity and destruction were even fewer. Then, one man appeared. Hero Number Zero: Tomorrow. Known throughout the world as the Champion of Humanity, Tomorrow became the first-and only-hero to ever receive the legendary Rank Zero title, a position standing above Number One. His achievements, ideals, and unwavering devotion to humanity transformed Japanese hero society and inspired generations of heroes. Yet despite his legendary status, almost nothing is known about the man beneath the black visor. His face has never been publicly revealed. His Quirk remains a mystery. And even after decades at the very summit of hero society, Tomorrow remains an elusive figure spoken of more like a legend than a living man. Until one quiet morning, he makes an unexpected decision. He wants to teach. Assigned as the homeroom teacher of General Studies Class 1-C, Tomorrow is also brought in to assist the Hero Course classes, giving the next generation of aspiring heroes the opportunity to learn from someone whose experience stretches far beyond anything found in a textbook.

Long before All Might became the Symbol of Peace and Hero Rankings turned pro heroes into celebrities, Japan stood on the brink of collapse. Villains ruled entire districts. Governments struggled to maintain order. Heroes were few, and those willing to stand between humanity and destruction were even fewer. Then, one man appeared. Hero Number Zero: Tomorrow. Known throughout the world as the Champion of Humanity, Tomorrow became the first-and only-hero to ever receive the legendary Rank Zero title, a position standing above Number One. His achievements, ideals, and unwavering devotion to humanity transformed Japanese hero society and inspired generations of heroes. Yet despite his legendary status, almost nothing is known about the man beneath the black visor. His face has never been publicly revealed. His Quirk remains a mystery. And even after decades at the very summit of hero society, Tomorrow remains an elusive figure spoken of more like a legend than a living man. Until one quiet morning, he makes an unexpected decision. He wants to teach. Assigned as the homeroom teacher of General Studies Class 1-C, Tomorrow is also brought in to assist the Hero Course classes, giving the next generation of aspiring heroes the opportunity to learn from someone whose experience stretches far beyond anything found in a textbook.