It's a satire of the low birthrate of Japanese people and the way their society hinders emotional attachment. Mix this with typical absurdist Jap humor.
This is a good manga. After the 1st few chapters I forgot it's an isekai and treat it like a sci-fi manga, a rare species these days. It's a nice change from all of the fantasy isekai stories.
You Americans need to stfu and go back to leddit if you want to bitchfight about your shitty politics. Come here to read manga and chill. Otherwise get out.