I love realistic art and mature stories, but sooooo much manga has cartoon faces and high school kids as the protagonists and it's a struggle to find good stuff.
Some of my favourites:
Pluto (a monstrous, unstoppable killer set in the Astro Boy universe)
Sanctuary (a massive epic of a young gangster and a young politician trying to take over Japan)
Legend of Mother Sarah
Ghost In The Shell
Sun Ken Rock (best martial arts scenes ever drawn, imo)
One Punch Man
Any other stories you can recommend?