Sayuri Ikui married a divorced coworker who has a child from his previous marriage, becoming the stepmother of teenage boy Shinji. However, their relationship is far from smooth, leaving Sayuri troubled and emotionally burdened. One day, her only source of support—her husband—announces a one-night, two-day business trip. Sayuri's anxiety grows steadily, eventually reaching its breaking point. That night, she resolves to open up to Shinji, urging him to share anything on his mind, and in doing so, discovers the hidden truth buried deep within his heart.