Hamari Adhuri Kahani starts off with Vasudha Prasad (Vidya Balan) who is almost on the verge of collapsing on the streets of Bastar district, while her husband Hari (Rajkumar Rao) is pouring his heart out to a doctor emphasizing on the fact that Vasudha did visit him wearing a red dress, something that the doctor rubbishes as his hallucination. Amidst that time, he gets to know that Vasudha has set for heavenly abode. That’s when he visits his son’s home to do the last rites of his dead wife… only to be shooed away by his son. When everyone is fast asleep, he escapes with Vasudha’s ashes to be immersed in Bastar and not in river Ganga. But before leaving the home with the ashes, Hari leaves behind a diary for his son that tells the tale of Vasudha.