Attack On Titan
People live behind mountain high walls, because on the outside there are hulking; lumbering giants that look like skinless humans called Titans. They breach the wall, and a splatter fest of violence erupts. The only defenses are crews of swordsman that use Bat Grapples and zip line to high altitude to conduct sky scraper murder battles. The animation is frightening and the action is beyond intense. It is unfinished at the moment, but since one of the series writers is from “Berserk”, you know the story will just get deeper and darker.