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Based on context clues, it seems that the first few chapters of this manga occur before the events of the anime, the mid-to-later chapters occur concurrently with the anime, and the final chapter occurs after the conclusion of the anime. I haven't actually seen the anime, and I have no plans to watch it, so these educated guesses will have to be good enough. I also have to assume that the people this manga is following, the student council members, are the primary antagonists in the anime. They have the goal of conquering the world, though their methods are to create petty annoyances and hope that those eventually boil over into mass conflict. There is a green hedgehog that gives them marching orders. I was actually enjoying the gags and stories a decent amount when it was just focusing on Akoya, Arima, and Kusatsu (the student council members) and I thought the story got a lot more boring once it started trying to involve the Earth Defense Club (starting in chapter 5). The characters are largely just built around one central personality quirk that defines them--like with Akoya caring about beautiful things or Naruko constantly thinking about how things could be monetized for profit. The art is crisp and aesthetically pleasing, with no glaring defects. But it can also feel a bit generically glossy in its cuteness and simplistic in its backgrounds and detail-work.