Set in 1995, Prem Prakash Tiwari (Ayushmann Khurrana) owns a cassette shop in the local market of Haridwar. His father is keen on getting him married to an educated but overweight girl Sandhya (Bhumi Pednekar). In spite of not liking her, the school drop out Prem agrees to marry her as he cannot attain a girl with ‘Juhi Chawla-level-of-looks.’ In addition, the fact that Sandhya is trying to be a school teacher, his family asks him to think of this as a financial help too. Eventually, in an elaborate community-wedding ceremony, Prem and Sandhya get married.
Prem visibly shows his disinterest in the marriage and does not consummate the marriage on the wedding night. While his sister, aunt and mother argue about his non-existent life, Prem leaves for akhara. Friends and seniors make fun of him and he tells them about his anguish. His trainer suggests that he must run away but that is not an option for him. At home, Sandhya tries to get Prem attracted to her. But he is too embarrassed to even walk to her on the street. Prem and Sandhya’s relationship continues to remain strained although they share a kiss and have sex on their second night together. Over time, Sandhya’s frustration shows; when Prem’s aunt brings up a petty topic, the two have a heated exchange of words and she tells them how he does not treat her well.
Amidst all this, a close friend of Prem’s gets married. Prem and Sandhya go for the ceremony where due to his excessive drinking and jealousy over his friend’s pretty wife, he tells everyone that sleeping with Sandhya feels like hell. Sandhya hears this and slaps him in front of his friends and he slaps her back. The next morning, Sandhya reflects on what she’s been through and decides she has had enough and decides to leave Prem. She blames her father-in-law for his lack of respect towards women and not giving his son a proper education. Sandhya’s mother tries to pacify her, saying she must return to her husband. But she decides that she can live by herself. Meanwhile, Prem decides to channel his energy into studying and to take his English paper again; he enrolls for the examination. His friends give up on him; after a verbal squabble, they throw him out of the group.