Maybe I think this anime is not to bad if you someone who don't need much story and i guess this anime is not bad at all and i know for some people this anime is very boring and have so much fan service and sometimes have some dry jokes but this anime that where you can watch when you don't want to thinking about the story plot and when you're horny i guess hahahaha but in my perspective it's not really bad anime for just stress relief and if you want to know the next story after episode 13 you can read the mangafrom chapter 70 the story will be focused on relationship between satou and the ring princess in satou world not in the isekai and the story will be end with satou have children with his 5 wife's and become king in the isekai

NB: Sorry for the little spoiler