As for that manga:
Finally read the thing. It's indeed short, and people die pointlessly all the time. Women are pretty much depicted as sex-objects, up to fighting naked (literally!), the protagonist being an asshole to one and still bedding her. Realistic or plot-devices? Either way, this wouldn't fly nowadays... Or perhaps it would, as all of his motivation to fight is to avenge a woman though. Either way, it's not revolutionary, I've seen better works with similar plot. I noticed the protagonist seems to repeatedly bash against metallic walls, which was probably the inspiration for the bash mechanic in your game. He also has magical super-pain resistance where a broken wrist and knee does not impede him much.
As for the ending, honestly that cut out sounds like an improvement compared to the original thing. The protagonist survives what seemed to be a kill-fest and that's the only thing noteworthy.
I'll check the show later.