Ha ha hahahhahahahahhah aha aha aha....
This manga is so dumb man! Imagine Marle walking to her family and says: "Yeah, so I shagged the legendary hero. So I don't have to get married anymore..."
Her parents: "Throw that legendary hero out! Bring the crappy prince we married you off to!"
Who are you kidding?! No one is going to put a nobody prince over the legendary hero!
This author wants to have it both ways. He wants a classic princess story and he made a Gary Stu overpowered hero and those two don't mix at all! In fact one cancels the other!