Well people their a series I would like to dicuss and that is Death God 4 by SATOGANE Shou.
Here's a brief description of the series I got from Baka Updates.....
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.
BTW here is a link to the first Chapter By JAC
A DDL will be up shortly.