The film stars Prem Nazir, Sathyan, Madhu and Sharada in the lead roles.
She has two grown-up siblings, Gopi and Malathy, who have scant regard for their sister's troubles getting food on the table and educating them.
Malathy is incredibly spiteful, doesn't help in the house, and spends her time reading magazines, which her sister cannot afford.
Her boss, Hari, is a good man and helps her out when the head office clerk, Swami, attempts to withhold her salary and makes her work late on purpose.
Vimala then reveals that Rajasekharan is interested in marrying Malathy and has met her several times to ask for her hand in marriage.
Soon, Malathy is pregnant, and Vimala borrows money yet again and takes leave from the office to look after her during the last trimester and after the birth of her child.