[1][2] In the village of Ammapatti, Azhagammal toils as a laborer under the oppressive rule of an arrogant landlady, citing her status as an orphan.

In the neighboring village of Melappatti, Subramani, the son of a cloth shop owner, travels to Ammapatti on his bicycle to peddle his wares.

Azhagammal's biological father, the landlord, arranges for her to marry a man involved in illicit liquor production.

Dr. Rathinam successfully resolves a romantic dispute between an elderly couple, earning Azhagammal's praise.

Subramani informs Azhagammal of this development, and in her excitement, she accidentally ingests sleeping pills, mistakenly believing them to be skin fairness tablets.

Dr. Rathinam, who had been attending to an emergency patient in Sokkampatti, returns to find Azhagammal unconscious due to excessive pill consumption.

The landlord reveals that he had remained silent during the panchayat meeting in hopes of securing a marriage between Azhagammal and Dr. Rathinam.

[5] The Indian Express wrote "Aayusu Nooru is one of those unpretentious films based on rural subject; [..] There are poignant situations that the director has handled with some degree of competence".