Update this chapter if you want people to be interested

This is interesting, and I would like to see longer chapters. Prologues don't need to be long, but what you have here now feels more like a summary than an actual chapter. As a suggestion, maybe you could add more descriptions- maybe write out a conversation where Lagravis tells Laval that he's going to step down as ruler. It would set up the rest of your story in the same way, and also provide an interesting way for the story to start.
I'd also recommend against saying that your summary and/or story is bad, because if you don't like it chances are your readers won't either. And I didn't think it was bad by any means, just a little short. I'm looking forwards to seeing more of this!

I saw the ending of the show if you want to know