He didn't ask to fall through a rift into a world he'd never seen. He didn't ask to land on a rooftop in the middle of a hero patrol, in a city built on fear of exactly what he is. And he never once asked for the chance to prove them all wrong.

When Rimuru Tempest — Demon Lord, Great Sage-bearer, ruler of a nation built on second chances — crashes into the world of My Hero Academia, the Hero Public Safety Commission doesn't see a person. They see an unregistered, unclassifiable threat with power that dwarfs anything a Quirk has ever produced. Hunted by heroes, studied by villains, and eventually courted by All For One himself, Rimuru has exactly one thing on his side: the same patient, unshakable choice that built his kingdom in the first place — to keep choosing peace, even when the whole world is pointing a weapon at him for it.

This is a 12-part, full-length "What If" saga — slow-burn escalation, real political stakes, a genuine redemption arc, and a final confrontation that pits a demon lord's mercy against the single most dangerous man in Japan.

Written by James, for **Unlimited Crossover**.

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