Yumiko's daughter injured her foot, and Chisato stayed at her daughter's house to help with chores. Chisato devotedly supported Yumiko, but her son-in-law Shuuta looked at Chisato with feelings that surpassed those for a mother-in-law. And then, it happened when Yumiko was asleep. Shuuta, who hadn't seen Chisato since Yumiko's injury, embraced and kissed her. Chisato hesitated about her son-in-law's infidelity, but her heart and body, which had been lonely in their fake marriage, gradually accepted Shuuta...
