In the year 2223, located in Kyoto Prefecture, Earth faces a crisis due to the existence of bird-like creatures known as "Harpies," which feed on humans. These creatures have led to a decline in the world's population, resulting in widespread poverty. One of the members of the "Executioners," a unit responsible for eliminating Harpies, is Sokaishougo, who enjoys gambling, adult entertainment, and food. While absent from work as usual, Sokaishougo encounters a flock of Harpies and appears to be in danger of being consumed by humanity's natural enemy. However, there may be a hidden secret within Sokaishougo's body that could change everything. This sets the stage for an unconventional gluttonous dark fantasy story.