In the year 2075, ten-year-old Iris sees a boy in a rainbow suit fall from the sky. His name is Arco, and he’s from a distant, utopian future where time travel exists. Moved by his story, Iris hides him and becomes determined to help him return to his own time. As their bond grows, she discovers courage and resilience she never knew she had—proving that even the smallest heroes can change the course of time.