One day, mother Ran witnessed her son having sex with his girlfriend and was overwhelmed with jealousy, shocked to realize she had been cuckolded by her own son. Desperate to win him back, she devised a plan to use her sexual skills to train and dominate him. Following through with her scheme, the son gradually became emotionally dependent on his mother Ran, growing unable to live without their intimate relationship, and became passionately devoted to their nightly encounters.