Haruka once lived with her husband and children, but after losing her husband, she continued life with her son, daughter-in-law, and grandson. However, last month her son began living apart for work, and shortly after, Haruka fractured her leg, prompting her daughter-in-law to rush over to care for her. As a result, Haruka and her grandson were left alone together in the house. Grieving the loss of her husband, Haruka's heart has been filled with loneliness and longing for the past, yet new emotions have begun to stir within her. Meanwhile, her grandson is deeply curious about sex, and his desires grow stronger each day as he matures into adulthood. Now, under the same roof, the evolving relationship between grandmother and grandson takes an intense and intimate turn, drawing increasing attention.