‘Natun Sansar’ is the problems that lovers Suprassana and Rama go through before they are united. Rama and her mother had left her father when she was small. So, Rama has grievances against him. Suprassana’s father on the other hand sells his son to his fiend Rajiv Ghosh and promises to get him married to his daughter Bipasha for 1,00,000 rupees. Suprassana marries Rama secretly. Suprassana goes to work for Rajiv unaware of the deal. In the mean while hi s father insults Rama and forces her to leave the village when he finds out about their wedding. Rama misunderstands Suprassana and thinks he has left her for Rajiv’s daughter. But, Suprassana refuses to marry Bipasha. In the meanwhile Rama gets to know that her boss I actually her father and they are united. Suprssana is falsely accused of theft charges and the police is after him. But, Suprassana’s friend Subharngshu and Bipasha help him by revealing that Rajiv and Manoj are the real culprits. All the misunderstandings are resolved and everybody is happily united.