Based in Calcutta during its most unsettled times in the 1970s, the film deals with the inseparable life of Bikram and Bala. The story of 2 boys, boys who became refugees. Refugees who became gun couriers. Gun Couriers who became coal bandits, coal bandits who became Calcutta's Most Loved, Most Celebrated, Most Reckless, Most Fearless, Most Powerful! A story of two happy-go-lucky renegades who came to be known as...GUNDAY!