After her divorce, Yayoi lives alone with her adult student son. She worries about his poor grades and future while struggling with sexual frustration of her own. One day, her son's best friend Takashi, an adult classmate and the brightest student in their class, comes over to help with his unfinished homework. Despite his promising future, Takashi has a secret insecurity: he is still a virgin who has never touched a woman's body. When Yayoi learns the truth, her maternal instincts flare up...