Kuttan Thampuran is the son of Subhadra Thampuratti and Kochanyian Thampuran of the Maangaattu Kovilakam. Kuttan has suffered from epilepsy since his childhood. He is rough and violent in his character and is feared by all in the village. Haridas is his classmate despite being two years younger and develops a special bond with Kuttan from childhood. Hari always accompanies Kuttan and carries iron keys to assist him in case the seizure develops. Both Hari and Kuttan grow up to be unsuccessful in their respective lives, and Hari is criticized for this by his father Bhagavathar, a well-known classical singer who has not been financially successful. Hari has had a liking for music, but Bhagavathar discourages him from music and persuades him into a professional degree course. Kuttan, meanwhile, had frequent epileptic seizures and is a nuisance in both his home and the village, despite seeking various medical treatments.
Unknown to Bhagavathar, Hari has a natural talent as a singer and has abundant raw talent which he displays at the local temple. Thankamani, who is dependent on Illam, is a student of Bhagavathar and falls for Hari after she hears him sing. Hari, though initially reluctant towards Thankamani, soon develops a passionate relationship with her based on mutual interest in music. Kuttan discloses to Hari that he is the only person who loves him, and they reaffirm their brotherly love for each other. Meanwhile, Thekkemadom Nampoothiri advises that the only treatment for Kuttan is to get married. Both Valiya Thampuran and Thampuratti plan to get Thankamani as a wife for Kuttan. Kuttan agrees to this, unbeknownst about the affair between Hari and Thankamani, and Thampuratti persuades Hari to forget Thankamani and leave the village for Kuttan's sake. Kuttan is devastated after coming to know about everything after their marriage and commits suicide.
Years later, an aging Thampuratti calls for Hari, who has grown up to be a well-known singer in India, to pay her a visit. Hari's visit to the village and subsequent happenings form the rest of the story. Meanwhile, Thankamani is paralyzed and unable to speak probably from the shock of her forced marriage and then the subsequent suicide of her husband, Kuttan.
When Hari sings "Raga Sudha Rasa.." for Thampuratti, then hearing his voice, Thankamani attempts to sing along. Soon, she displays signs of getting cured, and now, Thampuratti passes on, relieved that Thankamani can be reunited with Hari.
The acclaimed soundtrack of this movie was composed by Bombay Ravi, for which the lyrics were penned by Yusufali Kechery and also selections from traditionals.
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