IS: Infinite Stratos 2, Sword Art Online II Recommendations
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.