Kiseijuu, Variante Recommendations
A parasite attaches itself to the mains character arm which then gives them the strength that they then use to fight and kill other parasites.
Both characters go through a change in their hand due to an unknown source. The the characters go through a lot of psychologically damaging events because of this change
Both mangas contain plenty of gruesome elements,as they are both in the horror genre.
They gave of quite a similar feeling in my opinion.