The moment he said he'd awakened it was pretty much clear he was going to be the Demon King. Even Before that it was starting to hint that he'd changed in some way.
So she awakened as a hero and her brother awakened as the demon king? But it doesn't mean they have to fight. It could primarily just mean they can't be together anymore. That's tragic if that's the case. They are clearly very close to each other so it would be sad if they had to fight or something.
He should be the demon king I guess but his followers seem kind of nice so I wonder how this will play out, before I saw the brother I was imagining a much younger boy
Woah, okay, this is interesting, I wanna know what happens next! A maid pulling out a holy sword, then her brother being a 'King', what??? Thanks fort he update!