The story begins in Rhesera, a country that’s fighting for its survival. It’s not known how they appeared, but nocturnal eldritch monsters have invaded and destroyed the neighboring country, and encroached on Rhesera. The King formed a group called the Nighthawks to stave off the monsters’ raids. The mortality rate of the Nighthawks was so high, a lottery to draft people into the Nighthawks was created. The story follows Will, one such recruit who seeks the answer behind the monsters' appearance.