The first anniversary of her husband's death. Her heart's wound has yet to heal. One day, the widow Mio accidentally injures her hand. Out of kindness, her father-in-law offers to assist her. From meals to baths, and even taking care of her lower body. In the midst of this, the father-in-law becomes aroused by his beautiful daughter-in-law. To Mio, who refuses only sex due to her sense of chastity, Shinya proposes a different kind of sex.