 If you liked
Rosario to Vampire
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 ...then you might like
Ookami-san to Shichinin no Nakama-tachi
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In the beginning of both series the male protagonists lack fighting abilities and are considered weaker (if not useless) than their female companions. However, in the progress of the show they develop their own skills in order to protect the girl they love.
The style of the ecchi moments is also quite similar.