In the first minute and a half of this show, it parodies Gunbuster, Gundam, and several other anime all at once. Nor is it a typical slice-of-life anime; There is a real sense of continuity and mystery to this show. No major drama or angst, just an interesting hook.
Also, these characters are ADORABLE. The opening theme is also great, and the closing is a hilarious parody of idol anime, complete