In a village in the Cuddalore district, an aging school sits at the heart of a tense land dispute. A powerful landowner wants to demolish the building to sell the land, while the school's old students and teachers rally to keep it standing. The school is run by Kokila, who not only teaches there but also studied there as well. The building was originally constructed by Kokila's grandfather, which deepens the family stakes. A rift within Kokila's family grows as her uncle pushes to demolish the school and cash in on the land, leaving the building in a deteriorating condition.
To marshal support, the teachers devise an alumni reunion plan. Kumarasamy, a poor man from the same village and Kokila's classmate, is sent to Kanchipuram to meet the district collector Vetrivel, who also is an alumnus. Vetri and Kumar were close friends in childhood, and their reunion rekindles that bond. Soon they also reconnect with Muthu, now a film director, who remains a steadfast friend. The three men vow to unite the alumni and bring the community together to save the school.
A flashback recounts their school days: Vetri, Kumar, and Muthu come from modest means. Vetri falls in love with Kokila, a girl from a wealthier family. A nurse named Jhansi(/actor/sriya-reddy) visits the village for a medical camp and forms a warm connection with the trio as she helps and cares for them; she even supports Muthu's education after his father's death. Jency, a visiting nurse, also plays a part in the younger years, helping Muthu, though she is not a central figure in the present-day plan.
Back in the present, Kokila's love for Vetri resurfaces, while the two families' tensions flare. Kokila's father clashes with Vetri, and in the ensuing violence, Vetri's father dies. Kokila is locked in a room by her family, and Vetri, heartbroken, leaves the village. He later returns to participate in the reunion, but his relationship with Kokila remains complicated.
The alumni reunion is staged in a grand way for the village's 75th year celebration, drawing media attention. The landowner presses to demolish the school, but Vetri takes a stand and files a case on behalf of the school against Kokila's uncle. The court delivers a verdict in the school's favor, and the event paves the way for renovations funded by generous alumni donations. Kumar reveals a truth to Kokila: Vetri is not actually married, a lie meant to free Kokila from old heartache. As the truth surfaces, Kokila understands Vetri's enduring love, and Vetri recognizes why Kokila was once imprisoned by her family. In the end, the two are reunited, and the school survives to serve future generations.
