Hi! I'd say you should watch Banana Fish and Terror in Resonance. Banana Fish is extremely dark and has themes of abuse/rape and drugs. It gets philosophical as well. Terror in Resonance is short yet so action packed, and it's heavy on morality. They're mature for sure.
thank u :)
@engie
Yeah don't listen to the Banana Fish recommendation, that show is fan servicey as fuck. It also spends half its runtime fetishizing gay relationships in a really gross way. Think 15yr girl yaoi fanfiction bad.
@TidePodChan I see. I didn't personally see it that way, I enjoyed the crime/mafia aspect of BF and the soulmate like bond between Ash and Eiji, which I thought was shown nicely. The show also establishes why it's wrong to sexualize the characters ESPECIALLY Ash. Any "service" moments aren't exactly service, they're crucial to the plot and emphasize Ash's trauma. To each their own though.
@TidePodChan I don't mean to be rude, but could you elaborate on how Banana Fish is fan servicey? I've watched the show recently and as far as I can remember, there was zero fanservice.