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My son's daughter-in-law, Yuriko, came to take care of my father-in-law, Toru, who had been spending a lot of time without any motivation since his wife's predecessor. Her husband, Keigo, has been cold recently, and Yuriko has been dispelling her loneliness by meeting her father-in-law. However, Yuriko finds her love for her father-in-law's late wife and her kindness. Then, one day when her husband was alone with her father-in-law on a business trip, Yuriko took a bold and nasty action with that passion in her heart.