The Diary of West Bengal is a story based on true events that revolves around the illegal influx of Rohingya Muslims and Bangladeshi's who infiltrated into the state of West Bengal of India, and were facilitated by the state government. It follows the journey of Suhasini (Arshin Mehta), a Hindu widow who joins a group of widowed and destitute women for safety and gets into Bengal from Bangladesh. Suhasini falls prey to "love jihad" and encounters severe religious discrimination. Determined to expose the political machinations, Suhasini embarks on a campaign to compel the Indian government and human rights organizations to take action.