After reading the synopsis I couldn't help but laugh, and this is what Yarima Queen does. It's an extremely silly hentai whose sole purpose is to make you laugh. No matter how serious the story may be, or how good the beginning may look (yes it begins with its best sex scene), it is nothing more than a stupid hentai.
If you try to watch it like a hentai, you would be disappointed (as I am). Remove the sex scenes and what do you get? A stupid kids show.
I would advise you to watch it only if you want to watch something hilarious.