 If you liked
Yahari Ore no Seishun Love Comedy wa Machigatteiru.
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 ...then you might like
Fruits Basket 2nd Season
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They both are similar as:
# Both have complex dialogues.
# Both have love triangle (fruits basket - kyou, yuki and tohru/ oregairu - hikigaya, yukino, yui)
# Both characters have complex emotions
# Same sense of slice of life pacing
# Both stories start slow
If you like fruits basket, then you would like oregairu.