The year is 2019—a year where two eras, Heisei and Reiwa, intersect.
In the Seto Inland Sea, the island of Sarubotoke has discreetly flourished as a den of prostitution ever since the war.

On one side is the Futatsuguri clan, the most influential family on the island that has been running its pleasure industry since the Showa era.

On the other is a motley group of four gathered from different corners of the underworld, each having crossed to the island for their own reasons.

And on both sides, a cursemonger—shamans who perform assassinations via cursecraft. The perfect crime in the modern age.

Set against the backdrop of this lawless island, a battle of wills unfolds.

And behind it all, a terrible curse as old as the war itself has been lurking in the shadows for 70 years.