Ninja Gaiden - Death Counter is likely a fan-made or unofficial title related to the popular Ninja Gaiden franchise. It's possible that this "Death Counter" aspect is a modification or an additional element to the existing gameplay, focusing on score and enemy defeat counts within the Ninja Gaiden framework.  The developer and official status are uncertain, demanding further research.

Ninja Gaiden - Death Counter

Ninja Cop Saizou (Japan)