On the night after seeing her husband off, married woman Kaori (30) arrives in Tokyo by bullet train. Following her separation from her husband, she begins searching for a new chapter in her life. With no children, their relationship carries a special, different atmosphere. Even business trips have become something she looks forward to like dates. Her adorable gestures and tender, shining eyes gradually draw her partner in. Spending time with someone other than her husband feels thrilling and emotionally stirring, like living in a secret world. Yet, the enjoyable moments don't last forever, and time together grows limited. Within this fleeting window, she strives to discover a new version of herself.