Ayumi, who lived in a condominium with her husband, was dissatisfied with her selfish life. One day, I ran into Suzuki, a young man who moved next to me, and dropped the key. At that time, they fell in love with each other at first sight. Ayumi, who can not speak of it, intentionally unlocks the key and tries to deepen his relationship with Suzuki. And then they get to know each other deeply.