Nonomiya Ryota is a successful professional, a man who works hard and is accustomed to winning. One day he and his wife Midori get a phone call from a provincial hospital where their son, Keita, was born six years earlier, and discover that they were victims of an infant swap. Little Keita is actually the biological son of another couple, who is raising their real son together with two siblings in more disadvantaged social conditions and a very different lifestyle. Ryota must make a terrible decision: to choose his natural son or the child he has raised and loved for six years?
