Goro decided to gift his mother, Chisato, the Hawaii trip he won in the neighborhood lottery, as a thank-you for her constant kindness. However, when she returned, Goro couldn't help but gasp at the sight of her. Her entire body was tanned a deep golden brown, with clear tan lines from her swimsuit still visible, instantly stirring intense emotions within him. As he sees those sun-kissed marks during everyday moments—her cleaning or doing laundry—lewd fantasies about his mother begin to take root in his mind. Struggling to maintain his composure, Goro finds his resolve crumbling when Chisato whispers sweetly, "My body feels so hot and feverish... I think I'm going crazy..." His confusion deepens as forbidden desires grow. The shifting emotions hidden within their mother-son relationship add profound intensity to this story.