After her divorce, Yayoi lives alone with her son and is currently worried about her son's future and frustration as he is not good at studying. One day, her son's best friend, Takashi, offers to help her son with his unfinished homework. Takashi is the most intelligent boy in the class and has a promising future. But he also has his own worries... he has never actually touched a woman's body and is complexed about being a virgin. Learning this fact ignites Yayoi's maternal instincts...