House of 5 leaves: mature, samurai, ronin, action, plot, deep character progression, psychological, anti heroes. A pretty underrated series, with a different art style, which is quite unique in it's own way. The story is simple, we have a swordsman who needs work, and when desperate, willing to work for the strangest things.
YES DUDE! I forgot about Saraiya-Goyou, such an underrated and beautiful gem! Great recommendation!