Duds Hunt
Excellent and violent story of revenge. Main protagonist is repeat criminal who enters a dangerous hunt game for cash. But someone is pulling his strings.
DEAD Tube
Hideout
A dark story of a writer pushed into a breakdown after losing career, losing son, and having a worthless wife and oppressive in-laws. On a trip to an island.....things go straight to horrific hell.
Feeding lamb
My general advice: just don't. It's seriously gory. Not a little or medium gory. IT"S FUCKING APESHIT gory. In fact, I'd tag it torture porn. I regret my curiosity of seeing how it ended, cause I had to hold down nausea while doing so. You have been warned. (Yes, there is actual story and characterization, but geez...) If I were the type who supported censorship--I'm not--this kind of stuff would be on my list, right along with the worst or shota and lolicon.
Shingeki no Kyojin