Hayama Haruko, a 40-year-old housewife. With her husband constantly working late and her son often out playing elsewhere, she had gradually grown restless and dissatisfied. One day, she stumbled upon a porn magazine in her son's room. Out of curiosity, she called the number listed inside. To her surprise, she quickly became addicted to the sensation, and phone sex soon became part of her daily routine. But when her son discovered her secret, an unexpected new relationship began to unfold between them.