The Fenrir Far Eastern Branch were researching the Taboos associated with the Aragami when they encounter "Susano" 
All of a sudden a strange boy appeared and confronted Susano alone. He specialises in Aragami taboos, and is a member of "Asasoru"...

A prequel to the video game by the same name. 
The video takes place in the year 2065, six years before the events of the videogame. In the video, three wielders of the "divine weapons" from the Fenrir Far East branch, an elite military task force, arrive at a military operation against the powerful creatures called Aragami. One of the three, Souma, is a protagonist in the videogame.
 
(Source: Anime News Network)

AD2072, fearsome monsters, known as Aragami" (Bewildered Gods), appeared on Earth and start preying on humans. Human population had decreased down to 1/100 in just a few years, and the world is about to come to an end. However, there's one group of people who battles with these fierce monsters, using the biological weapon, known as the "Jinki" (God Device). These people are called as "G.E." (God Eaters). The story revolves around one of the God Eaters, Silva, and his conquest to bring back the hope of humanity...

The Far East, 2071. 
The domain of the mad gods. 
 
In the early 2050s, unknown life forms called “Oracle cells” begin their uncontrolled consumption of all life on Earth. 
Their ravenous appetite and remarkable adaptability earn them first dread, then awe, and finally the name “aragami”. 
In the face of an enemy completely immune to conventional weapons, urban civilization collapses, and each day humanity is driven further and further toward extinction. 
 
One single ray of hope remains for humanity. 
Following the development of “God Arcs”—living weapons which incorporate Oracle cells—their wielders are organized into an elite force. 
In a world ravaged by mad gods, these “God Eaters” fight a desperate war... 
 
(Source: Daisuki)

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