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From the liner notes

Famed director Nomura Yoshitaro (Castle of Sand, The Incident) and bestselling Japanese mystery author Seicho Matsumoto combine forces on The Demon (Kichiku), a chilling and complex tale of betrayal and murder. A strange relationship develops between a man, his wife, and his mistress, and a young boy becomes the pawn in a dangerous game of passion and intrigue that ends in a shocking climax. Photographed in sumptuous color, The Demon will keep the most avid mystery buff guessing as it weaves an unforgettable tale of greed, lust, and obsession.