 If you liked
Yahari Ore no Seishun Love Comedy wa Machigatteiru.
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 ...then you might like
Yesterday wo Utatte
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Romances that are not particularly romantic, but are nonetheless very entertaining. Oregairu is more comedic/parodic; Yesterday is more dramatic/straightlaced. Main characters are generally immature, broken, or borderline toxic personalities who are nonetheless immediately and completely relatable and usually sympathetic. Both shows do a good job of portraying the complication of real-life emotions and insecurities interestingly and convincingly. Both shows create emotional payoff for the viewer by having the characters straighten out their own emotions and then act on them - even when those emotional actions wind up creating conflict or don't actually solve the root problem of the situation or character.