The Ueshima household had been shrouded in sorrow after the loss of their husband and father, but things slowly began to brighten as their daughter started dating her cousin. Mitsuko sincerely wished for her daughter's happiness and felt genuine relief. However, one day, she accidentally witnessed the two secretly meeting. Though she knew she shouldn't look, an unexpected ache stirred deep within her, and before she could stop herself, she reached out a finger. That night, the nephew came home devastated after failing at work. Wanting to comfort and support him, Mitsuko pulled him into a warm embrace. But as he took her hand, he slowly guided it toward his crotch. Surprised by the size and hardness she felt, Mitsuko hesitated—yet with her daughter away, she chose to accept his desire. And so, a new, forbidden relationship began to bloom...