Reiko has been raising her son as a single mom since childhood. Her love for her son gradually transformed into a love for the opposite sex. ...... Her son also began to see his mother as a woman. As time went by, her son went to college and lived on his own. As time passes, they embark on a long-awaited trip to the hot springs. The desire for this long-awaited relationship deepens their love. Reiko resists her son's sudden confession, but eventually accepts it. In fact, she loves him too. ...... He kisses her, caresses her breasts, and pleases her. ......