Taking inspiration from the Mahabharata, one of India's most significant epics, Gaṅgā is a tale of heartbreak, promises, and love. The story follows Gaṅgā a powerful, yet helpless, celestial river goddess, whose womb becomes the medium to fulfil the higher purpose of gods and men.

Cursed and doomed to be born as mortals, the eight Vasus choose Gaṅgā to be their mother. She promises to release all but one from the curse; the last must live on earth. Gaṅgā chooses her beloved Shantanu, mighty king of Hastinapur, to be the father. But, to keep her promise, she must also break his heart.