Ayumi Shinoda makes her Madonna debut, unveiling her sun-kissed body! She wins a Guam trip through a neighborhood lottery and gives it to her son, Atsushi. When she returns, the once plain and modest mother has transformed—deeply tanned and more outgoing than ever. As she goes about her housework, Atsushi can't help but notice the tan lines on her cleavage and buttocks, secretly peeping whenever he gets the chance. But one day, he accidentally catches Ayumi sucking a man's cock. Flustered and stunned, he tries to flee, only for her to approach him with a knowing smile: "You were watching, weren't you?" That single sentence shakes Atsushi to his core. Shocked by his mother's new, sensual self, a forbidden desire begins to stir within him.