I watched Attack on Titan, just season 1 though, I wouldn't call it very mature though, standard power fantasy with some gore. I think I watched Erased, not sure though.
I like stuff like Claymore, Black Lagoon, Elfen Lied, Psycho Pass, precisely because they tackle weird mature subjects and don't shy away from a little gore or boob like western stuff, that's become so boring and predictable; I've seen it all before :)
hmmm... yeah. the Mature part in Attack on Titan isn't the story... I want to remember something for you but nothing comes to mind.... well, I know your steemit.chat account if I remembered something I'll tell you there.
I think Erased (most of it anyway) has Psycho-pass maturity level... but that's just my opinion.
Someone said Umineko is more Mature than most anime but I haven't watched it so I don't know (the same person considers AoT very mature).
A ok. I'll have a look at Erased. Thanks for the suggestions. Well, AoT, I dunno, it's cool, don't get me wrong, but again, not mature imo. Gory and action packed, yes, deep, not so much :p