Fireflies tells the story of two estranged brothers, Shiv and Rana. While Shiv is a successful banker, and a part of the city's elite, Rana is a law school drop-out, who survives doing odd jobs.
Their lives have been shaped based on a long-past incident, which has reincarnated again to creep into their lives. All they have are memories, which like fireflies glow in the darkest moment, and then suddenly they are gone forever.