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Ryota (pop star Masaharu Fukuyama) is a Toyko architect on his way up, working six days a week, providing well for his wife (Machiko Ono) and son Keita (Keita Ninomiya). Piano lessons and a private school mean Keita is already fast-tracked as well.

But their lives are turned upside down when Ryoto and his wife receive a call saying that their son had been switched at birth.