Expat barrister Amit Ray is a sharp, intellectual, and romantic man, adept at defeating opponents in debate. While vacationing in the Shillong hills, a motor accident leads to his introduction to Labanya, which blossoms into romance. However, the pragmatic Labanya soon realizes that Amit belongs entirely to a romantic world that cannot be reconciled with daily domestic calculations.
Meanwhile, Ketaki arrives in Shillong, displaying the ring given to her by Amit and claiming him as her own, thereby breaking Labanya and Amit's marriage plans. Ultimately, Amit confesses that his love for Labanya is like the water of a large pond—water not meant to be brought home, but water in which the heart merely swims. Whereas his relationship with Ketaki is like water drawn into a pitcher—daily drawn and daily used.
By chance, Shobhanlal arrives, wanting Labanya entirely for himself.
Welcome, dear reader, to Shesher Kobita, a timeless epic of love and marriage, gains and losses, emotion and reality.