 If you liked
Top wo Nerae! Gunbuster
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 ...then you might like
Houkago no Pleiades (TV)
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Both are GAINAX's productions about BISHOUJO, PARTNERSHIP, ROMANCE and SPACE.
DIFFERENCES:
Gunbuster - sci-fi, mecha, echhi
Houkago no Pleiades - magic, Maho Shoujo, moe
It seems that they are totally different types of anime, but both of them have a fantastic imagination for space and the theory of relativity. So in some ways, Houkago no Pleiades shows respect for Gunbuster.