30-year-old Shiori became a teacher at this school right after graduating, and seven years have already passed. There was a time when she worked hard to become a teacher accepted and trusted by her students. However, conflicts at work, romance, marriage, divorce—life brought various events that she had to overcome. Now, those days feel both long and short. After her divorce, she settled into an ordinary, uneventful daily life filled with comfort. She simply goes through each day mechanically, and though she's aware of it, she sometimes despises herself for being unable to change. She no longer clearly knows what she likes or dislikes about herself. Then one day, her routine life is abruptly shattered by an unknown man. What follows is a seven-day imprisonment—an extreme experience. Crime lurking within daily life, pleasures impossible to experience under normal circumstances, and a new turning point etched into her heart.