It was Haneda's daily routine to hang out at his friend Matsui Yuta's house after school. Yuta's mother, Yuko, is kind and beautiful, and Haneda admires her. Haneda secretly follows Yuko with his eyes, but one day, Yuko shows him an unusually vulnerable appearance. Haneda tries desperately to hide the swelling in his crotch, which is instantly stimulated by the sensual sexiness of a sweaty adult woman. However, Yuko, as if toying with Haneda, boldly seduces him by showing her breasts without a bra and her panties without panties...