Hikaru, a housewife, lives with growing frustration due to her husband's emotionally distant and indifferent attitude. One day, she turns her attention to her neighbor's cock, and gradually feels an intense heat building in her pussy. She begins seducing him herself, eventually becoming sexually involved. After that, she becomes so deeply dependent that she can't live without having sex with him. Repeatedly giving in to their physical relationship, she loses all rationality and completely immerses herself in the affair.