The story starts at a bar where Balu (G V Prakash Kumar) is in a wedding outfit and just enters as he orders his drink, two people tell him to go and get married, while they are talking about debts Balu does fast calculations and impresses them. They ask him to tell his story and he does.

Balu is always top-ranked in his college. Mahalakshmi (Shalini Pandey), his cousin comes to Balu's house to continue her studies. She is in awe of her Mr. Perfect 'mama' as she expresses this after seeing him. Upon seeing Mahalakshmi Balu asks for her name to which she responds as Veera Venkata Sathya Sai Durga devi Seetha Mahalakshmi, Balu says her name is too long and he can't waste that much memory just to remember her name so she says that he will just call her Mahalakshmi. Mahalakshmi takes her first exam and walks out crying as she doesn't understand English, Balu helps her, and she gets the first rank and Balu gets second. Balu is hurt by this as he usually gets first rank, and he plans to sabotage her studies, Mahalakshmi does the same. But to their surprise Ajay (Mayilswamy) stands first this time. Meanwhile, Mahalakshmi's father brings her a marriage proposal, but she doesn't want to marry him. Balu and Mahalakshmi compromise by agreeing to help each other. Balu helps her in getting the proposal canceled and Mahalakshmi distracts Ajay from studies for the sake of Balu, but Balu gets attracted to her. The couple start studying together and Mahalakshmi distracts Ajay. Balu gets first rank and is awarded a building from his principal, at the housewarming party, Mahalakshmi says Ajay is great as he studied well even though Mahalakshmi distracted him. Balu is hurt by this statement because he doesn't want Mahalakshmi to think anyone is better than him, his ego is also hurt and the couple chooses to separate.

After three years, they meet again in the hospital because their grandmother suddenly falls ill. While trying to find out how Balu is doing, Mahalakshmi realizes he hasn't changed at all. Both argue a lot until their parents try to get them married. Surprisingly, Balu mentions that he has a girlfriend named Swapna that he hopes to marry. While introducing her to his family, Mahalakshmi notices that Swapna is much more than she is. To get back at Balu, she agrees to marry Ajay, Balu's former rival in college. Ajay turns out to be the head of a company that makes more than Balu's company. Balu, angry that Ajay is greater than he is, puts his company in risk in hopes that he can surpass Ajay's company. Unfortunately, his partner cheats him, and Balu is on the verge of losing his company. Mahalakshmi, now his project manager, toils to rescue him. They make an excellent team and Balu's company is saved.

In an after party, Balu credits Mahalakshmi for his success. She again unknowingly hurts Balu's ego. This time, Balu confesses that he felt the need to be great in Mahalakshmi's eyes because he loved her. When she tells him she shares his feelings, Balu refuses to believe her. After the interference of their grandfather, they are united in the end.