20 x 5 years. The country has launched a highly confidential project to combat the declining birthrate and the aging of society. It was a surrogate mother whose crimes with a healthy uterus paid for the crime by offering a mother on behalf of a couple who did not have children. Namiko Kurata, who accidentally killed her husband's other child, was sentenced to death and was put in prison. But the choice was either "death penalty" or "surrogate mother." A paradise prison that creates a new life, but where she was waiting for Namiko.