Arjun is an Action Sentiment based movie. In which, Arjun (Mahesh Babu) and Meenakshi (Keerthi Reddy) are twins. Arjun and Meenakshi complete their graduation. Meenakshi and Uday(Raja) who study in the same class fall in love and they do not express it when they leave the college. Raja's marriage gets fixed by his Madhurai based parents Bala Nayagar (Prakash Raj) and Andal (Saritha). Raja sends an invitation card along with a letter expressing his love to Meenakshi and she expresses her feelings to Arjun. He goes to Madhurai along with his parents and gets Uday and Meenakshi married to each other. Bala and Andal are cold-blooded murderers and they are not happy with this. Arjun foils all the attempts by Bala and Andal to get rid of Meenakshi from the life of Raja. The rest of the story of the film is about how he saves her from them.