Sonoko Kiritani is 46 and lives in Kanagawa Prefecture. She has been married to her office worker husband for 22 years and is the mother of two children. Ever since she was little, she loved to sing, and her dream was to become a professional singer after graduating from music college. However, when she had a child with her husband, whom she dated during her student days, she gave up her dream and became a full-time housewife. Her hobby is singing her heart out until late at night at karaoke parties with a group of friends, but in fact she made a mistake with a man in the group... "Until then, I had sex with my husband twice a month, but the first time I cheated on him, I realized how loud my moans were."