This is just hentai with a longer screen time. Main character gets Isekai'd into a world with a bad UI and starts figuring out everything from there. The idea that slaves in this world are well rounded women who will serve you as best as they can towards your goal... which is primarily either slaying creatures in the labyrinth or getting down and dirty in the bath and bed. Superbly animated motion when things get erotic. Outside of the obvious, it is not terrible, it is just black and white slice of life isekai. Enjoy it for what it is. I can't believe it's not hentai...