Concerned that his son has failed the college entrance exam three times, a father hires a private tutor to help him study. He asks Yuka, the wife of a friend, who previously worked as a tutor. Yuka gladly accepts and begins tutoring the boy right away. However, during the lessons, unexpected things start happening. The glimpse of her youthful cleavage through her shirt, her soft breasts pressing against his arm as she leans in to help, and the occasional flash of her panties between her thighs—these subtle stimuli begin to affect the young student, making it hard for him to concentrate. Watching him react, Yuka gradually feels her own emotions stirring.