Yumi, a single mother, worked herself to the bone, saying, "If it's for the happiness of my daughter Ami," and her efforts paid off, as she found a good husband and got married off safely. She spent each day savoring the joy of seeing Ami happy, but deep inside Kokoro, her desires as a woman still smoldered... Unable to do anything about the excitement she felt as she became aware of her daughter's husband, Hiroshi, as a man, Yumi managed to stay calm by comforting herself. However, she never dreamed that Hiroshi himself had seen her indecent behavior...