In the same hospital, two baby girls are born: one into an aristocratic family and the other into a destitute household living in the city's slums. The attending nurse, Michiko, secretly swaps the infants due to a personal vendetta, altering their fates from that moment onward. Years later, the lives of the two girls remain entangled, with the wealthy Miki mistreating the impoverished Nozomi, even as both share a common aspiration to become singers.