Agni Pariksha is about a young couple - Kiriti - Uttam Kumar and Tapasi - Suchitra Sen. Tapasi is married at a very young age to Bulu.Tapasi's mother does not accept her daughter's wedding and brings her home. Tapasi's father dies of shock. Tapasi grows up into a well educated girl and once goes to a hill station for holidaying where she meets a rich young man, named Kiriti. They fall in love. However Tapasi has already wedded Bulu, a teenage village zamindar boy, when she was a child. The guilt chases her everyday because she cannot forget her past. She decides to get married again, but her brother reminds her about her past though her mother wants the marriage to happen. Tapasi approaches her grandmother for help asks her what she ought to do. Her grandmother reminds her about Sita's "Agni pariksha" in Ramayan. Sita triumphed over every obstacle by the test. She hopes Tapasi would also emerge victorious after going through a similar test. Tapasi is determined to face the truth and she cames to the old village. She tries to meet Bulu, but sees Kiriti in front of her. She comes to know that Kirit is Bulu, her long lost love. She thus wins back her lost love and triumphs over her guilt