Ultraseven. Even after half a century has passed since its initial broadcasting, his story is still etched into people's memories. The story that connects the present as the future of 55 years ago, will be depicted as an 'IF story' that "may have existed" as an episode of the series at the time of its broadcast in 1967, and tell the story of "how it happened."

An American actor in Tokyo struggles to find purpose until he lands an unusual gig: working for a Japanese 'rental family' agency, playing stand-in roles for strangers. As he immerses himself in his clients' worlds, he begins to form genuine bonds that blur the lines between performance and reality.