Rettai Roja is a Tamil drama television serial about Abhirami and Anuradha, twin sisters, who are poles apart. While Anuradha is a bold and fierce lawyer, Abhirami is a compassionate tailor. Anuradha leaves no opportunity to belittle Abhirami. Santosh, a man from a rich family, is madly in love with Anuradha, while his brother Sanjeev is in love with Abhirami. Will Anuradha let Abhirami marry Sanjeev?