Saki Aikawa lives as the new wife in the Aikawa household, portraying a gentle, warm, and loving family life that's occasionally awkward yet filled with affection. Her husband, Ryuichi, is kind and considerate, while her stepson, Koji, has a slightly reserved personality—but a real familial bond exists between them. One sudden incident drastically shakes the foundation of their family. A secret Saki has been hiding is accidentally revealed in front of Koji. The shock of this revelation triggers a chain of events that transforms their family relationships entirely. Each step forward leads to a pivotal moment that will profoundly alter the future of their family.