Venkatachalam (Sarath Babu) and Indumathi (Sumithra) are siblings. Indumathi hates men and she is adamant that she will never get married. Sanjeevi (Kamal) is a friend of Venkatachalam and often visits his house. Sanjeevi likes Indumathi's attitude and starts teasing her many times, they often quarrel as well. Though Indumathi too starts liking him, she is too egotistic to show her romantic side to Sanjeevi as she doesn't want to remove her stubborn attitude 'mask'.Thilagam (Sobha) is a young girl from the village who comes to work as a servant in Venkatachalam's house. Her innocence draws Venkatachalam towards her and they get intimate. She becomes pregnant but Venkatachalam refuses her. Thilagam is driven out of Venkatachalam's house and gets support from Sanjeevi and Kasi (Hanumanthu), a person who is hard of hearing,also worked at Venkatachalam's house and has affection towards Thilagam. Sanjeevi provides Thilagam with lodging and requests Kasi to stay with her and look after her. Thilagam delivers a child.Months later, after Sanjeevi and Kasi appealed to his conscience, Venkatachalam repents and is ready to accept Thilagam, but she decides to live her life with Kasi, who took care of her during her pregnancy. Indumathi, meanwhile, throws away her 'stubborn' mask and asks Sanjeevi to accept her. Sanjeevi accepts her love.