Uruu Kono Tsuki

A couple has been together for a decade and cohabiting for five years. The time since they last had sex is uncertain. Though not married, they live as an established couple. One woman wants to be seen as a romantic partner again and suggests a hotel stay, but her partner declines. While outside the hotel, she is approached by a younger man who agrees to join her. He is more laid-back about relationships. He poses a question about what she would do with an additional month in the year, similar to a leap day. She recognizes this could be infidelity, but imagines what might happen if she had such unstructured time. With all restraints lifted, an intense and unrestricted relationship begins.