Chisato's daughter Yumiko has injured her leg, and she is staying with her daughter and son-in-law to help with the housework. Chisato is devoted to supporting Yumiko, but her son-in-law Shuta looks at Chisato with more than just a mother-in-law's feelings. Then, while Yumiko is sleeping, it happens. Shuta, who has not seen Chisato since Yumiko was injured, embraces her and kisses her. Chisato hesitates at her son-in-law's infidelity, but Kokoro and body, which have felt lonely as a fake married couple, gradually begin to accept Shuta...