Some things aren't meant to be. Some things are.

A hero isn't meant to be a demon, and a demon isn't meant to be a hero. But sometimes, what's isn't meant to happen will happen.

In the span of an incomprehensible amount of time, a blur in the space-time continuum happened. A passing soul got sucked into another universe. On that day, a demon king died, but a hero was born.

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Note: Will need to see if this is something people would want to read to continue.