 If you liked
Sword Art Online II
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 ...then you might like
Yahari Ore no Seishun Love Comedy wa Machigatteiru. Zoku
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Both share teenage MC who can be considered as pretentious loners but end up having many girls surround them. And those girls end up falling in love with the MC thanks to their nice personality that like to help others. The setting and premise iare different tho, one is set in highschool mostly while the other is in game. Watch both if you want harem with a pretentious loner MC.