Selvanayagam "Selvam" is a hard‑working, impoverished fisherman whose life centers on love, pride, and the harsh currents of a village economy. The story opens with his deep devotion to Bhagyam, the daughter of Nachimuthu, a friendship forged through time and shared struggle. When Sivaanandham loses his job, Selvam’s sister‑in‑law Annapoorani belittles him at every turn, pushing him to prove his worth in a world that treats fishermen as disposable. Although he doesn’t own a boat yet, his resolve grows stronger: he fights social resistance to motorboat loans, takes the leap, and buys a motorized vessel to plumb the Bay of Bengal’s bounty. The village community, led by the scheming moneylender Vadivelu, seems to want to keep him down, pushing a boycott that makes Selvam and his partner Peter fish in isolation.
Amid the struggles, Bhagyam and Selvam’s romance blossoms in secret, a fragile bright spot against the gray backdrop of poverty. Nachimuthu tries to help by enabling the sale of their catch in the nearby village, but the threat from Vadivelu grows more personal and dangerous. A night-time attack on Selvam’s boat triggers a violent confrontation in which he defends his livelihood against Vadivelu’s men, and Annapoorani, increasingly afraid of Vadivelu’s reach, urges Selvam to leave the house for his own safety. The tenderness of their bond is undercut by the storm of debt and social pressure pressing on them from every side.
Tragedy strikes when Nachimuthu dies, and Vadivelu doubles down on his plan to force‑marry Bhagyam to settle the unpaid debt. A cyclone roars across the Bay of Bengal, and Selvam and Peter are already at sea. Their boat is battered by the elements; the next day the reports say all boats overturned. Selvam is badly injured but survives, and he and Peter are rescued and hospitalized far from home. They write to Bhagyam, but Vadivelu tears the letter and keeps her in the dark. Believing her lover to be dead, Bhagyam flees the hamlet to escape a forced union with Vadivelu’s men.
A month passes, Selvam returns, and he learns that Bhagyam is missing. Unknown to him, Bhagyam has given birth to their son, Rajan, a revelation that reframes the arc of the family’s fate. Back in the village, Selvam begins to rebuild his fortune: he secures loans, expands the fishing business, and becomes a wealthy entrepreneur—an ascent that earns him both admiration and new enemies. When Bhagyam finally learns he is alive, she travels to meet him, only to discover Selvam has moved on and married another woman. Heartbreak follows, and Annapoorani’s mounting anxiety about the family’s future grows ever stronger.
Now a father and a man of means, Selvam has to contend with new dynamics in the family he has built. Sivaanandham, once a marginalized figure, seeks a job and is reluctantly given a place within Selvam’s expanding enterprise, signaling a shift in power and loyalty within the community. Years pass, and Rajan grows up under the shadow of a village that refuses to grant him a boat because of the stigma of illegitimacy. He learns the truth of his father’s wealth, and despite the glamour of Selvam’s success, the fragile social order around them strains under the weight of pride, betrayal, and revenge.
Rajan, now a fisherman himself, witnesses the old wounds reopen when Ravi, Sivaanandham’s son, sabotages Selvam’s motorboats to trap fishermen in losses. Rajan lashes out at Selvam’s generosity, declaring independence from a benefactor who feels increasingly distant. This rift deepens as Uma, Selvam’s daughter, falls for Sekhar, a hotel singer, complicating the family alliance with Dhanakodi, who hopes to unite Uma with his own son Ashok. Selvam agrees to the marriage arrangement without Uma’s consent, provoking further tension and a moral test: should wealth and power override personal happiness? Uma resists, and Dhanakodi’s fury intensifies when Selvam refuses to follow the old script.
Unknown plots unfold behind the scenes, with Ravi using Dhanakodi to bend Rajan to his will. Rajan ingests a plan to avenge Selvam by manipulating the law and the economy: smuggled silver bars are planted in Peter’s boat, and the police seize the contraband, dragging Selvam into a legal trap. Peter is blamed and pushed aside, while Mudhaliyar, Selvam’s accountant, becomes a vehicle for money power to reshape reality. A high‑stakes wood‑procurement scheme is uncovered, and Rajan—now in a position of leverage—exploits it to wrest control of Selvam’s enterprises, temporarily pushing Selvam to the margins of his own life.
In this war of property and legitimacy, Rajan’s loyalty wavering, Dhanakodi manipulates the situation to force a transfer of assets back and forth. The two men—father and son—find themselves aligned in a fragile alliance, as Rajan uses his newfound power to push Selvam away. Devi, Dhanakodi’s daughter, grows close to Rajan, while Bhagyam’s memory continues to haunt the decision to build a life without him. The tension peaks as Uma’s engagement to Sekhar is arranged to salvage a semblance of harmony, but the old wounds erupt in a violent confrontation. Rajan intervenes to protect Uma and to reunite the family, while Bhagyam longs for a sense of closure and belonging by spending her afterlife beside Selvam.
As the conflict escalates, Rajan discovers the truth of his paternity and finally embraces his responsibility. He works to restore the family’s name by returning the properties to Selvam, only to face Dhanakodi’s increasing desperation. A brutal confrontation ensues, ending with Bhagyam wounded and the boat becoming a corridor of chaos as Selvam, Bhagyam, and Rajan flee from Dhanakodi’s men. The pursuit ends in tragedy when Dhanakodi shoots Selvam and Bhagyam, leaving Rajan to endure the loss of both his parents.
In the end, Devi arrives with the police to arrest Dhanakodi and his accomplices, and the entire fishing hamlet mourns the deaths of Selvanayagam and Bhagyam. Rajan and Peter honor their last wish by pushing the coffins of Selvam and Bhagyam together into the ocean, a final ritual that binds their fates to the sea that made them and took them away. The film closes on a note of quiet, stubborn resilience—the sea remains, the memories linger, and the living carry on the legacies of a family torn apart and then reunited by love, ambition, and the unyielding pull of family ties.
