Death God 4

Death God4 / デスゴッドフォア / 末世纪死神 Monsters descended upon the humans all of a sudden, monsters that can't be detected by most, unless they have a strong sense. An invisible predator, it feasts on humans to grow in strength and powers. 4 Death Gods are chosen to destroy these monsters and to seal the "sink" hiding the monsters fast.

The Doujinshi & Manga Lexicon
Vol. 1/)
Vol. 2/)