Vallamai Thaaraayo deals with the change that takes place in a married woman's psyche. Here, a premarital affair and its repercussions form the focal point in the plot. Torn between her own longing for the lover she spurned and a good life partner who understands her predicament, the lady protagonist faces an internal dilemma and ultimately, finds a solution to the problem more or less through trial and error.

Nandhitha (Chaya Singh) and Anand (Parthiban) are newly wed. Anand is happy with the marriage but Nandhitha, who married him against her will, is disturbed and unhappy. She sacrificed her love for Sekar (Srikanth) because Nandhitha and Sekar's families did not approve of their affair. Nandhitha's father Veerasamy (Anandraj) forced her to marry the city-dweller Anand. But even after marriage, Nandhitha is unable to forget Sekar. She longs to go back to him and be his life partner. Helpless, feeling imprisoned in this forced marriage, longing to be united with Sekar, she still steps into Anand's household as his bride. Soon, Nandhitha learns that Anand is a fine gentleman. His broad-minded views and his practical attitude towards life come as a surprise to the troubled female. Even so, she does not reconcile herself to their marriage, but keeps dreaming how happy she could have been with her old lover. As a consequence, she feels distanced from her husband and does not enjoy marital bliss. Her spirit continues to yearn for Sekar's love; even when she tries to convince herself about her husband's kindness and sterling qualities, Nandhitha is pulled away by a stronger feeling for Sekar.

Gradually, unable to handle her problem, mustering her strength, she takes a shattering decision and files for divorce. Next, Nandhitha embarks upon a frantic search for her lover and finally finds him. Where, when and how? Does Sekar preserve the same degree of love and longing for Nandhitha? Overcoming all constraints, is he prepared to join her? What happens when they meet again?

Debutante director Madhumita has tried to solve the problem in her exclusive style. Applying minimum drama and maximum logic, she has done justice to the heroine's portrayal and her emotions, thus also presenting a convincing and elegant solution to her problem. Neither Anand nor Sekar can resolve Nandhitha's problem. So, who helps her out? What solution does she choose to overcome her self-created sorrow?? To know more and to enjoy the riveting sequences, watch Vallamai Thaaraayo on the silver screen.

Undoubtedly, the film is yet another highlight in Parthiban's career. As a modern citizen with progressive attitude who accepts his wife's affair with an unbiased outlook (unbelievable as it may sound), he has given a glowing performance. His cool smile, composed demeanour, prudence in his approach – all will surely impress audiences. The role is very appealing with its subtle style of presentation, even without any super-hero masala. For Chaya Singh too, it is a novel portrayal. The role resembles nothing the skilled dancer/ actress has done earlier in Kollywood. She has returned to the silver screen after a small pause in her career in a superior role. With a refreshing aptitude, she has put in maximum effort to give life to the rebellious character. The pricking guilt and the spluttering angst-riddled outbursts she displays as the grief-stricken Nandhitha will torment each and every spectator. Srikanth has put up a good show through his striking cameo. Performances of seasoned actors like Anandraj and Kuyili and Karunas' comedy are other outstanding aspects in the film.