 If you liked
Kämpfer
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 ...then you might like
Maji de Watashi ni Koi Shinasai!
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Both are Harem/Action/Ecchi with a guy who can really do nothing and super powered girls around him who protect them.In Maji de Watashi ni Koi Shinasai the guy has no powers but contributes to the group through thinking up stratagies while in Kampfer even though the guy has a power he more holds the group back then contributes.