The Demon (鬼畜, Kichiku) is a 1978 Japanese psychological drama directed by Yoshitarō Nomura and written by Masato Ide, based on the short story by Seichō Matsumoto.

Consumed by the jealousy and power struggles of their own relationships, a man, his mistress and his wife involve three children in their own games-with tragic results.

After Sōkichi stops providing his mistress with monetary support, she leaves her three children with him, whom she insists are also his, and disappears.

Sōkichi is bewildered and his wife is livid.

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