I'll Take Responsibility, Hero!

[Fantasy, Western-style, Regression, Childhood Friends, Status Difference, Hero Male Lead, Limited Affection Male Lead, Younger Male Lead, Strong Male Lead, Polite Speech Male Lead, Beautiful Female Lead, Affectionate Female Lead, Strong Female Lead, Capable Female Lead, Devoted Female Lead] Leon, who was diagnosed with a terminal illness at the age of twelve and confined to his bed. Leon's only hobby was listening to stories about the hero who protected this world. Leon hears that the hero he cheered for is leaving to subjugate the demon king. But Leon dies at the young age of twenty-five, before even hearing the outcome of the demon king's subjugation. However, for some reason, he re...