This review will also cover the concurring Season 4 of TeeKyuu. I start finding things out about the TQ series and it's spin-offs; being done in a minimalized fashion with a small staff yet resulting in episodes that only go for around 2 minutes. (I'm thinking about how SHAFT does it but they don't like doing things "normally." So yeah.) The shows are obvious: TQ4 continues to be random, random, and random; tennis is maybe mentioned in one episode but this show's not about tennis anymore. It's mainly about Yuri, Kanae, Nasuno, and Marimo being themselves and comically playing off of each other. Nasuno's spin-off is mainly about Youta,Yuri's little brother, becoming Nasuno's butler and (because of the difficulty of her "magical airhead" personality) "automatic retort machine" (like his big sister).
Both of these shows are fun because of the "good" randomness (as oppose to the evil randomness that treats characters horribly because of their gender or what country they come from).
And IMMHO: Those episodes where Nasuno was kidnapped and where Youta was playing soccer against a zebra should've switched with each other.