Wataru Hoshino's quiet life in a dormitory shared with four girls takes a chaotic turn when he wakes to find a stranger in his room. After a punch to the face and a dramatic window exit, that same girl, Rinna Sawaki, shows up as his new classmate and roommate. What should be an awkward living situation becomes something heavier when the girls reveal why they've come to South Sakojima Island: their families are relocating within a year after the local industrial company shuts down. With an expiration date hanging over their time together, Rinna keeps everyone at arm's length, convinced that closeness will only hurt more when separation comes. The rest of the household refuses to accept that fate so easily. What unfolds is a quiet reckoning with grief, attachment, and whether it's better to avoid connection altogether or embrace the time you have. For viewers who find meaning in small moments and emotional honesty, this series offers something genuinely felt.