Living a happy life loved by her husband, Ryouko finds small joy in savoring cake alone. One day, her husband Tohru brings home a friend. After introductions, their eyes meet—this friend is Hanaoka, the man who once loved her. While Hanaoka sleeps in the next room, Tohru draws close to Ryouko, stirring her emotions. Reluctantly, she gives in, unaware that Hanaoka watches her intently through the sliding door. In this single moment, a crossroads of tangled feelings is etched forever.