The hero never appeared.

One day, upon hearing a baby's cry and heading toward it, I found a baby and a woman holding it were about to be attacked by a monster. I decided to help them rather than ignore it, but then I learned that the baby was the egg of a brave hero, who would become my natural enemy. The Demon King, having helped them without knowing this, was at a loss for what to do and decided to leave the baby with them for the time being.