Thiru and Surya are inseparable friends. They are so close to each other that Thiru selects a bride for Surya and vice versa. Their friendship is carried over from their grandfathers and fathers, who were thick friends. Thiru brings up Surya's daughter because he has no children. Shankara wants to separate them and does all he could to. Surya's sister becomes pregnant due to a love affair with Shankara's brother. On the eve of her wedding, Divya, Thiru's wife, helps her run away with the guy she loves. This breaks the friendship between the two as Surya's mother poisons his ears against Thiru. As expected, Shankara is behind this because he wants to avenge the death of his father Easwaramoorthy, who was killed by Thiru's father Vetrishwaran, an honest police inspector. Finally, in the climax, the two destroy Shankara, resolve their differences, and unite in the end.
Malathi Rangarajan of The Hindu wrote, "Lengthy flashbacks and unwarranted song sequences mar the tempo of Samasthanam. The story is strong, but the screenplay lacks crispness".[4]Sify wrote, "The director of the film Raj Kapur has not been able to come out with anything new as this film stretches beyond belief and endurance too".[5] Malini Mannath of Chennai Online wrote "director [..] moving his narration steadily through clichéd scenes and predictable situations".[6]Cinesouth wrote "Unbearable flashbacks and a torturous screenplay have made this film a word out penny in our eyes".[7]