Sakura was raised to believe that obeying her husband and dedicating herself to her family was a wife's duty, having learned this from a young age by watching her mother. She always thought loyalty to her husband was natural. However, over time, her husband's behavior grew harsher and his affection began to fade. One day, while her husband was away on a business trip, the married neighbor invited her to dinner. She decided to take a chance and went along. As they talked and shared their frustrations, they gradually opened up to each other, drawing closer. Influenced by alcohol, they ended up sharing a bed. The neighbor treated her with warmth and consideration—completely opposite to her husband—and Sakura slowly found herself drawn to him. For her, this encounter sparked a new emotion and brought about a major change in her life.