Araya left behind his life of a Black Coat soldier so he could live happily with the girl he love and have a small shop by a coastal town. But things didn't go as he dreamed of when the town gets attacked by demons and his wife gets murdered. However, Araya's will to protect his wife was so strong that a devil took interest with him and forged a contract. With the help of the devil Araya was able to exterminate all the demons. Catching the eyes of the Black coat colonel who was present at the scene, Araya is offered a position in the Black Coats. Now Araya is back as a Black coat and he will stop at nothing to achieve his goal of reviving his dead wife.