Grow up, my usual phrase to immature people. Changing and adaptation is natural to human beings, they tend to blend in the society as they grow up.
Jinrui wa Suitai Shimashita lives in an interesting world where humanity is on the verge of extinction, succeeded by a race of silly, mass-producing pixies bearing a continuous. Adorable and cute as they are, these little creatures are anything but are favorable.
Ah, our jejune character, as interacting with these terrifying creatures serves as her occupation. For the nameless "Watashi", being pulled into their world of games and magic is little more than a daily rate. Time loops and strange things happened.
How plenty of time my brother has, he watched it at the first time the broadcast the order and a second time in sequential, overall, he said, the experience is nearly the same, there's not really a "developing" part of the characters so even if we watch it in the beginning and/or as flash back from the middle portion, nothing changes very much. The pleasure, the crazy and strange aura of the episodes allow us that. Watch it as wherever you feel to.
Despite some problems in terms organization and efficient execution, what we have here is an intelligently written and thought-provoking piece. It's full of funny spectacles, satires, and a lot of good elements to relish about. I hope this gets a second season!