Every resident of the avant-garde metropolis of Bayron City, which was constructed using a recently found energy source, is guaranteed a luxurious and comfortable living. The reality is that Shuu Ogata, a youthful demon exterminator, has a modest life. Due to careless spending, he frequently struggles to make ends meet while owning a private military firm. Fortunately, Kisara, his demon mate, is happy to assist Shuu with domestic tasks—even if she does it a little too firmly for his taste. As the greatest threats to the city, demon hazards, are being countered by the two together. Although Shuu and Kisara work to ensure the safety of the town in the face of peril, they are unaware of the cost of eliminating the possessed.