Man, I was really enjoying this manga. In this final chapter, I was glad that the prince didn’t follow Rama on her journey. And the idea of her becoming the Demon Lord and having to face a new hero, I thought that was really clever. I was getting excited about the story when suddenly, out of nowhere, “THE END.” I have to admit, it was a shock.
EDIT: Researching on the internet, it could be that this "The End" is actually referring to the end of this arc, and not the end of the manga. Let’s hope so.