 If you liked
Buttobi!! CPU
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 ...then you might like
Sekirei
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I found these anime surprisingly similar. Both are about a girl (Robot in CPU/Mutant in Sekirei) protecting their master from the others that are the same kind as them. Sekirei is the better anime by a long shot, but odds are if you enjoyed this as I did, then you will for sure in enjoy Sekirei.
P.S. both anime feature
-Beautiful women are "servants" to their master's wishes
-Battles of epic proportion
-Very plain male leads
-Yes, nudity is in both as well.