Purbarag follows the journey of Indranath, a young man deeply influenced by his early childhood experiences. Orphaned at a young age, Indranath finds solace and guidance from his teacher, Jatileswar Chatterjee, and his family. After completing his education, Indranath returns to his hometown and encounters both familiar faces and new challenges. The film explores themes of loss, love, friendship, and the search for meaning in life. Indranath's experiences reflect the societal changes and cultural shifts of the time. Through his interactions with various characters, he grapples with the complexities of human nature and the importance of personal values.