 If you liked
Mahou Sensei Negima!
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 ...then you might like
Sekirei
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Sekirei has plenty of similarities, from what I see, like Rozen Maiden (Alice game and Sekirei Plan) and Claymore ("numbered girls", with higher numbers bring of higher strength), but none moreso than Negima. One main character, a harem of beautiful girls, with plenty of ecchi-ness, contracts with the main via kisses. Its a matter of taste which one a person prefers. Negima is has more lolis, and Sekirei has more boobs.