Kenji stays overnight at his friend Koichi's house. He has long harbored feelings for Koichi's mother, Yui—but his desire goes beyond mere infatuation, spiraling into something darker and more dangerous. One night, he accidentally witnesses Yui masturbating in the living room, trembling in fear of debt collectors. Shocked by the sight of her sucking a dirty male cock and moaning lewdly to orgasm, Kenji instinctively records the scene on his phone. That night, a devilish whisper echoes in his ear—plotting to blackmail Yui and manipulate her into his control.