7fates: Chakho (Novel) -

It all begins when Zeha wakes up in a hospital with no memory of how he got there. Retracing his steps, he stumbles into a terrible truth--the city is under attack by otherworldly monsters called the Beom, and at the center of is Zeha himself! But thankfully, he does not stand alone. Others who have bravely taken up the fight cross paths with Zeha, seemingly drawn to each other by fate. The seven hunters band together to defend their home, but they soon begin to realize that the Beom invasion is only the beginning...