Yuya has struggled to trust women since a girlfriend dumped him during his student days. Then Maiko, his mother's friend and a marriage counselor, visits the house. His heart races upon reuniting with the woman he once longed for. That night, alcohol leads them into sex. Maiko feels guilty, yet the two become addicted to their secret meetings and keep savoring the forbidden affair. But worried about the future of a man young enough to be her son, Maiko eventually...