After reading chapter 3Spoiler:It's quite obvious, that the royal family wanted to get off MC after defeating the demon king to make the prince the sole hero. So the mage probably petrified him, so that he could escape into the future.
After reading chapter 3
Spoiler:
It's quite obvious, that the royal family wanted to get off MC after defeating the demon king to make the prince the sole hero. So the mage probably petrified him, so that he could escape into the future.