Alright numbskulls, quit your bitching. The women in this world, the instant they didn't need men anymore, predictably became narcissistic, selfish, cruel misandrists and slavers, to the point of nearly driving the castrated, humiliated male sex to total extinction. This is a fanservice power fantasy revenge manga with a typical harem deal, and based on that premise, it's not only completely justified but absolutely necessary for men to survive and regain basic human rights. If you don't like it because it seems to be pro-male or anti-feminist or whatever, go cry about it on social media and hug your Anita Sarkeesian body pillow to sleep.
I don't expect it to be deeply philosophical or intellectually nuanced. I expect titties, I expect mob justice, and I expect it to be stupid, mindless fun. So far, chapter 1 is all of that, and I'm looking forward to more.