Rika is a 39-year-old homemaker from Nakano who has been married for 20 years and has an 18-year-old son. Looking back, even the arguments and exhausting years of housework and parenting now feel like happy memories. What hurts is that her husband no longer sees her as a woman. Unable to bear simply growing older in a cold marriage, she longs to feel the breathless excitement of a kiss and passionate sex one more time. She finally gathers the courage for her first affair, spending one day with a temporary boyfriend and taking a creampie.