Prinsesa Ng City Jail tells the story of Princess (Sofia Pablo), a young girl raised near a prison by her jail guard father. She brings light to the lives of the people around her, especially the convicted criminals. But despite the love and happiness she finds with them, Princess still longs for the mother who abandoned her.

The life of Princess changes when she meets a young inmate, Xavier (Allen Ansay), who also has his own familial issues. As their friendship blossoms, Princess teaches Xavier to forgive and forget the past. Meanwhile, Xavier leads her to her long-lost mother.