At the heart of the game is Bryce Boltzman, a renowned and immortal demon fighter. 500 years ago, Bryce failed to defeat a Demon King, where he lost all hope and passion for life. Since then, Bryce has lead a solitary life – until the formation of the NCDA.

The NCDA is the National Counter Demon Agency, and Bryce has been recruited to take on the demons that have again started to infiltrate the human world. It is here that he meets the mysterious Arcadia: a new agent reluctantly partnered with Bryce. While Bryce is a disinterested but an experienced demon fighter, Arcadia is cooler and professional. Together, they must fight against the hordes...