 If you liked
Boku wa Tomodachi ga Sukunai Next
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 ...then you might like
Yahari Ore no Seishun Love Comedy wa Machigatteiru. Zoku
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Both of them seem like regular rom-com anime but in fact they are rather deep and emotional.
They are centered around the relationships in a group of students that are not very good at dealing with others.
The main characters are also very alike: the weird/scary guy of the school with a cool imouto, the black-haired cold girl and the bright-haired (pink/blonde) enthusiastic girl.
Even if Haganai looks like a harem, in the end (like in Oregairu's case) it's all about the love triangle formed around the 3 main character.