 If you liked
Ookami-san to Shichinin no Nakama-tachi
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 ...then you might like
Yahari Ore no Seishun Love Comedy wa Machigatteiru.
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While not entirely similar from the surface, both these series deals with a club at school.
From there, the main male protagonist meets a strange female protagonist where they get off to a rocky start. There is humor and comedy and along with that, the main male protagonist seems to have a head of strange thoughts regarding various things.
Both series' artwork is also similar in a way and gives off a lighthearted feeling.
The two have a drastically different approach, but they're similar.
The main similarity is how all the main cast forms a club which helps people resolve problems.
Oregairu (Yahari ore no...) deals with real social situations, feelings, relationships, is heavy on social commentary and cynical interpretations.
The characters and interactions are a lot more life-like, subtle and yet intense, laden with unsaid truths characters have to infer.
Ookami-san is a light-mooded action school comedy with a hint of romance here and there. An easy watch, but enjoyable nonetheless.