There is an island called Rokukenjima in the Izu Islands of Japan. The island is the private territory of the wealthy Ushiromiya family, and rumors about the island have never stopped. A cruise ship is heading to the island. The people on board are all members of the Ushiromiya family. They came to Rokukenjima to attend the annual family meeting. The owner of the island, Ushiromiya Kinzo (voiced by Mugito), has been overwhelmed by his addiction to black magic research and alcoholism. The tribesmen came here to discuss the division of his huge inheritance. The seemingly friendly relatives have their own calculations in their hearts. As the only son of the second son's family, Battler (voiced by Daisuke Ono) looked up and saw sea cats circling in the sky. The storm is coming. There was a hunting murder on the island. The selfish tribesmen were killed one after another in a cruel manner, and the means of murder did not look like human beings at all. Could it be that the legendary witch Beatrice (voiced by Sayaka Ohara) came to take revenge? In order to find the truth, Battler, who couldn't believe it at all, had to engage in brutal battles with the illusory witch.