Ryuuzen Yuki is going to kill someone.

Specifically, the three corrupt figures in the television industry who mu*dered his childhood friend. The need for revenge burns deep in Yuki’s soul. He is only able to keep sane by clinging to his three self-imposed rules for revenge:

No matter what happens, act alone.

Do not involve anyone other than your targets.

If you fail, admit your crimes without complaint.

The stage for Yuki’s revenge will be Kakuriyo Island, a small tidal island south of Kagoshima Prefecture whose population was wiped out long ago in the bizarre mass-mu*der incident known as “The Beast of Kakuriyo Island case”. Though officially solved, the Beast of Kakuriyo Island is still the subject of many unsolved mysteries, not the least of which is the sheer, inhuman brutality of the crimes.

A television production crew comes to Kakuriyo Island to film a true crime special in which Mikumo Echika, an up and coming singer-songwriter and the descendant of the island’s former head priestess, will visit her family’s former home and discuss the incident that claimed her birthright. Yuki, having infiltrated the production as an AD, plans to trap them all and kill all three of his targets on the island with his own two hands.

But his plans are derailed when his first target is slain – by something else. Burning with rage that one of the men who killed Naoko will never suffer for his crimes, Yuki vows to confront both the killer and the remaining victims.

But his new enemy isn’t a mere human. The Beast of Kakuriyo Island is very real, and if Yuki seeks to achieve his revenge, he must learn what it is, how it operates… and how he can work around it and still manage to get away with mu*der.

Placed 13th in the 2022 This Mystery is Amazing! Awards and 7th in the 2022 Honkaku Mystery Best 10.

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