 If you liked
IS: Infinite Stratos 2
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 ...then you might like
Sword Art Online II
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For me, the series has similar build to SAO itself from the first season. IS 2 has Houki and Tatenashi, SAO 2 has Asuna and Sinon. Of course Ichika is Kirito who is surrounded by girls developing a similar harem. The only difference is that the other genres are somewhat different. But both is set in the future.