Rio marries a man much older than herself, beginning a new life as part of a restructured family. Initially distant from her husband's son from a previous marriage, the two feel awkward around each other, but over time that barrier thins, gradually developing into a comfortable, sibling-like bond. However, from the stepson's perspective, Rio is not merely family—she slowly begins to be seen as a woman. Amid this delicate relationship, Rio and her stepson end up spending a week alone together, and the story unfolds their shifting emotions during this intimate time.