Great Manga.... Totally uncommon and surprizing

I don't really get the point of this why did they make it in stone age they are just behaving like in recent common mangas

Boomer? millennials?

Boomer millennials?

I don't think there was romcom in stone ages for some reason

While I personally don't like some some aspects in the artwork, the story is actually pretty good and will at least make you laugh for a while