Guardian Dog

It is about earth being invaded by aliens...the guy on the front cover..(i do not know his name) was merged with a particular alien called the six eyes. Some time later...he was attacked by a girl..which name i also do not know...

Author: Fukaki, Shouko (Art), Shirakawa, Akira (Story)
Genres: Action ,Fantasy ,Sci-Fi ,Supernatural
Status: Ongoing