Kaathirupaen Unakaaha's cast includes Rukmani Devi and Krishna Kumari, and the plot revolves around a tragic love triangle which involves rape and blackmail.
Rukmani Devi Krishna Kumari The plot revolves around a love triangle, which unfolds into a tragedy. Knowing that Raja is in love with Shantha and is about to marry her, Raji's brother Kannan rapes Vanita in order to blackmail Raja into marrying Raji. 
