This shit is so ridiculously bad, it's almost a parody.
I'm not sire it isn't a parody, honestly! I mean, this is the logical conclusion of isekai with slave themes, from obvious one's like (tensei) no Skill Taker, to the more subtle, like Gunotaku no noses.
This is where that sex fantasy leads, ultimately; I'm not sure the artist isn't making a social statement... or so I hope...
Or maybe society just needs a nuclear cleansing, and this manga existing is proof. If it's not a parody, this is a pretty sick joke.
Cos FUCK this story is bad.