Fifteen years into her marriage, Ryoko lives in a state of marital separation within the same household, coexisting with her husband without any interference in each other's lives. Though she suspects her husband of having an affair, Ryoko lacks the courage to pursue infidelity herself, instead expressing quiet rebellion by occasionally enjoying solo trips. One day, during one of her usual getaways, she loses her smartphone. By chance, a man appears and offers to help her search. He turns out to be staying at the same inn. Together, they begin walking toward the inn.