Daisuke, who lost his father at a young age, grew up with his mother, Mikako. At an age when Daisuke was curious about women's bodies, one day he sneakily peeks at his mother changing clothes. Daisuke becomes excited by the sight of his mother's ample breasts peeking through the gap, and when he smells his mother's discarded underwear, he is so excited that he trips into a world of fantasy...