Set in the heart of small-town India, Ek Chatur Naar's story revolves around Mamta (Divya Khosla Kumar), a woman whose disarming charm masks a razor-sharp mind. Ambitious and shrewd, she moves through life outsmarting those around her with ease. A single mother to a young son and caretaker of a perpetually drunk mother-in-law (Chhaya Kadam), Mamta works for the railways by day and moonlights as a waiter by night, all while the trio struggles to make ends meet in a cramped, dilapidated room in a slum, located just behind a nallah.