Three years after her only daughter Kayoko got married, Keiko Hattori—left a widow at a young age—receives a melancholy phone call from her daughter: "I need to talk to you..." It becomes clear that the couple's relationship has grown cold. Keiko visits her daughter's home, hoping to mend their marriage. But instead, her son-in-law becomes captivated by Keiko's charm, his heart stirred by forbidden desire. A deeply emotional story unfolds, exploring the fragile bonds of family and the turmoil of illicit passion.