Bayron City boasts an advanced urban center powered by an innovative energy source, promising luxurious living to all inhabitants. However, Shuu Ogata, a young demon slayer, struggles to maintain a comfortable lifestyle despite running a private military enterprise. Impulsive spending leaves him frequently strapped for cash, but thankfully his demon partner, Kisara, assists with domestic duties, albeit more assertively than he prefers. Together, they confront the greatest threat to the city - demon hazards - constantly lurking in the shadows. Shuu and Kisara join forces to ensure the safety of the town, but the dangerous task of eliminating the possessed comes at an unknown cost to others.