Katha movie tells a love story in a very different manner. It was after a long wait and much of prayers that Madhava Menon and his wife Sethulekshmi were blessed with a child, a son. And hence they gave their son Nandu so much love and care that he grew up to be a very mischievous and playful youth. Madhava Menon wants his son to be a doctor, but Nandu is least interested. And then, a girl named Meera makes her entry into Nandu’s life. This is bound to be a turning point in Nandu’s life.