Kyoko, a wife of five years, was living an ordinary but happy life with her husband. However, she had one worry. Living with her father-in-law. She was frustrated by her inability to get closer to her father-in-law, who is a man of few words, and found his presence creepy, as she didn't know what he was thinking. However, one day when her husband was coming home late, she heard her father-in-law's voice calling her from the bathroom. "Kyoko, can you wash my back?" Kyoko was a little happy to be asked by her father-in-law, but from that day on, her happy married life began to waver greatly...