This movie chronicles how Chetan met his wife and the difficulties they faced due to their cultural differences.
A story about a romantic journey of a culturally opposite couple - Krish Malhotra and Ananya Swaminathan. They meet at the IIM-Ahmedabad College and during the program they fall in love. Complications arise after the program comes to an end and they decide to get married. Krish and Ananya belong to two different states of India. Krish, a North Indian Punjabi boy from Delhi, and Ananya, a Tamilian Brahmin from Chennai. They take a conscious decision; they won't get married until their parents agree. Everything goes downhill when the parents meet. There is a cultural clash and the parents oppose the wedding. To convert their love story into a love marriage, the couple faces a tough battle in front of them. For it is easy to fight and rebel, but much harder to convince. Will Krish and Ananya's love for each other sustain the battles? Will they manage to convince their parents and make it to their wedding?—UTV Motion Pictures
At IIM Ahmedabad, protagonist Krish Malhotra (Arjun Kapoor) is pursuing his MBA. Krish comes from a family very proud of their Punjabi heritage. His mother, Kavita, is in a troubled relationship with his alcoholic father (who is a retired army officer), Vikram Malhotra, with whom he has strained relations.
One day in the mess hall, he meets Ananya Swaminathan (Alia Bhatt), who comes from a conservative Tamil Brahmin family. Ananya meets Krish at a mess food line, while she was complaining about the Sambhar's quality. Krish helps her by sharing his own Rasgulla with her (as there was a limit of only one per student). Ananya then sits with Krish at his table.
Ananya is an economic graduate and is weak in math. As she struggles in class, Krish offers to help her out with the subject. Krish was looking for an opportunity to get close to Ananya, but didn't want to seem desperate. Ananya agrees and invites Krish to her room. Soon, Krish and Ananya start spending a lot of time together with each other. Even though Krish likes Ananya, but he continues to maintain a decent distance between him and her.
During this time, Krish feels attracted to Ananya, but fears that she does not feel the same way because she has rejected several boys from IIT colleges (as she says that she has been proposed 22 times by boys from IIT), where Krish is also from.
To avoid potential heartbreak, he abruptly stops studying with her without giving any reason. Ananya is shocked at this sudden change and barges into the boy's hostel and into Krish's room.When Ananya demands to know what is wrong with him, he accidentally blurts out all his feelings for her. Ananya kisses him, indicating that she feels the same way, and the two begin dating and living together for their two years on the IIM campus.
Krish tells Ananya that his real passion is writing, and that his dream is to make enough money from a steady job so that he can pursue a career in writing. He says that he wants to write a story about normal people that everyone can relate to.Krish gets selected for Yes Bank, while Ananya is selected for Sunsilk.
When their graduation comes, Krish and Ananya decide to get married as Krish proposes to Ananya in the middle of her Sunsilk interview. They introduce their parents to each other at the convocation ceremony. To their dismay, Krish's loud Punjabi mother Kavita (Amrita Singh) does not get along with Ananya's reserved Tamilian parents Radha (Revathi) (who is a singer) and Shiv (Shiv Kumar Subramaniam).
After the convocation, Ananya begins her marketing job in her hometown Chennai and Krish goes back to his hometown Delhi and with the choice of his workplace in his hands.Kavita and her brash family urge him to stay in Delhi and try to discourage him from his interest in writing. They also criticize his relationship with Ananya and tell him to get an arranged marriage with a Punjabi girl. There is a lot of tension between Krish and his alcoholic father Vikram (Ronit Roy).
Krish decides to leave his dysfunctional family in Delhi and shifts his banking job in Chennai. Initially, her family disapproves of him, but gradually, he builds a rapport with the family. He stays in a company guest house, where Ananya is a regular visitor. Krish and Ananya continue their sexual relationship.During this time, he tries very hard to win over Ananya's family. He tutors her younger brother Manju (Sharang Natrajan) for the IIT entrance exam, gets Radha an opportunity to sing at an event for his workplace, and helps Shiv create his first PowerPoint Presentation.
After all his effort, Ananya's family agrees to her relationship with Krish, and gives them the approval to get married. Krish and Ananya then travel to Delhi to win over Krish's family. Initially, Kavita and her family are hostile towards Ananya because they still want Krish to marry a Punjabi girl. However, they come to like her after she saves Krish's cousin Minty's wedding from being canceled due to a dispute over an excessive dowry.Krish reveals to Ananya that his bitterness towards Vikram was mainly because of his angry outbursts, which escalated one day when he hit him after he hit Kavita in an altercation, causing a strain on their relationship.
After Kavita approves of the marriage (Krish does not care about his father's opinion), Krish and Ananya decide to take a vacation with their families before the wedding. The vacation does not go as smoothly as planned when Kavita makes continuous snide remarks about Tamilian culture and complains how she is not treated with gifts the way a Punjabi groom's mother is traditionally treated. Shiv and Radha decide they've had enough and call off the engagement. When Ananya pacifies them and convinces them to give Kavita a second chance, they walk back in only to overhear Krish falsely assuring his mother that she can treat Ananya however she wants after they are married. Ananya does not want to start her marriage on lies and calls off their engagement. They return to their respective hometowns.
Both Krish and Ananya find it hard to live without each other, and Krish also has a hard time finding a publisher for his manuscript. Sometime later, he gets a call from Ananya. She says that Vikram came down to Chennai to speak to her parents, apologizing for his wife's shallow behavior. This allows for Krish and Ananya to finally have their happy ending.
The two families finally come together to get the couple married in Chennai. At first, Vikram declines to attend the wedding to prevent any further embarrassment, but at the last minute, he flies down to Chennai and apologizes to Kavita for his abusive behavior over the years. After getting married, Ananya gives birth to twin boys. Krish resigns from his job at the bank and publishes his book, 2 States, based on his and Ananya's lives.