Annually, the Ushiromiya clan gathers on Rokkenjima island at the behest of the enigmatic family patriarch, Kinzou, whose ailing health hints at his impending demise. Amidst a raging typhoon outside and tumultuous emotions within, the family vies for inheritance rights and the coveted title of Kinzou's successor. Battler, Kinzou's estranged grandson, returns after six years hoping for a harmonious reunion, only to be thrust into his grandfather's peculiar game of seeking hidden wealth. The stakes? Leadership of the family. However, this treasure hunt transforms into a ghastly affair as participants become pawns in a ritual to resurrect the legendary witch, Beatrice. Despite Battler's skepticism towards the supernatural, the escalating death toll forces him to question the reality of magic versus the sinister motives lurking within their midst.