‘Deewana Main Deewana’ is a package which has love, drama, thrill, dance, comedy and possibly everything that's needed to keep you engaged in a Hindi film. Basant (Govinda) is a guy who gets what he wants, sneakingly. He is friends with Vasant. At an antique shop, Basant and Vasant see an antique duck made of glass. Basant purposely drops to break it because he cannot afford it. One day, Basant sees Priya (Priyanka Chopra) and is head over heels in love with her. She proceeds to draw a smiley face on the glass frame. Basant tries to run after her but he spots her earring. Meanwhile Vasnat wants to enter a music competition but on the way their car hits a girl on a bike, which is Priya. She is in hospital and requires A1B blood. However Vasant is there (because the people who knocked her over took Vasant's car so he chased them) Vasant has the correct blood type and donates blood to save Priyas life. However this small event leads to the cancellation of the competition. Vasant is unaware the girl Basant boasts about is Priya the girl he knocked over. When Priya wants to contact Vasant to thank him for the blood donation, she unknowingly calls Basant but he doesn't know it is the girl he wants. The next day, Basant and Vasant along with Satya and Prakash await the call but a music group calls insisting that Vasant must present himself there. Just after Vasant leaves, Priya calls, but says that Vasant must meet her at the Railway Station to Jodhpur. She is wearing a blue cap, has a blue top and is carrying an English novel. A call follows, and there is a problem with the boys so Vasant has to leave. When Basant sees it is the girl he wants, he plays a pretext he is Vasant instead. Basant goes home and finds his friend smoking and thinking about his guru because he is in hospital. One day, Priya calls Basant's (Vasant's) house but his mother picks up the phone. Her stupid sister blatanly says an old woman and the mother thinks they are referring to her, Basant takes the phone and speaks expletives unaware it is Priya. Vasant (the real one) goes for a music job, he has a cassette and meets Uncle ~Shakti Kapoor). He calls Priya to help him out. The plot thickens, when, just before Vasant goes for the interview Basant tells him to change his name to Ranjini Priya for good luck and he meets Priya. Both are unaware that Priya sees the boy who saved her life and Vasant (Ranjini Priya) donates blood to a girl he didn't know because he never see her.

At the movies, Basant (as Vasnant) goes with Priya but he sees the real Vasant (his real friend) talking to Priya. He oversees the conversation, gets angry and drops his ice creams. He says that he's not in the mood to watch the movie so they leave. Priya meets the guys at their home (Vasant's). Prakash calls Basant (who is Vasant to Priya) the boys find out Basant never told them about his girlfriend. One day Priya wants Basant (who is Vasant to her) to meet Ajit Singh, her father (Prem Chopra) but he lies and says he's father is ill. The reason is because, when Ajit was pleading to save his daughter, Vasant shows up and says he'll be indebted to him. Basant realizes he saw Vasant so when the father sees him he will know it is not the guy who donated blood. At the airport, Priya and Ajit are waiting for the flight but secretly Basnat sees them. He purposely procrastinates to delay time and rejects her calls. But when Ajit leaves Basant acts as if he reached late. Outside a guy pushes Priya, Basant starts to beat him. Another day Basant calls Priya but he doesn't speak. He overhears Priya is going shopping. Basant calls after that and her father picks up. He says that he's in Hotel Heritage Room no. 448. But he return to Priyas house only to pretend if Uncle is there. But then a cop shows up and proclaims that Ajit is dead. Priya is heartbroken. Sharad Kuamr (Sharat Saxena) investigates the case. He says Ajit was murdered. Sharad immediately knows that Basant is the killer. This leads to the place where Ajit died. Meanwhile Vasant shows up at Priyas house (the real one) and wants to meet Priya to say thank you. Basant goes to the hospital and tears the page with Priya's name on it. Vasnat sees this and they start arguing. Both go to some rocky terrain to talk. Vasant realizes that Basant used his alias to win Priya's love. Basant gets angry and slaps Vasnat. He loses his footing but Basant catches him. But he loses his hand and Vasant cascades to his doom. At the house of Basant Sharad arrives and he realizes Vasant is Basant. Priya finds out too. She runs away. Basant chases after her and says it is true 'I killed your father' and his friend but it wasn't his intention. Priya takes a log and attack Basant. Priya nails herself with the log. Cops show up and Sharad shoots Basant. The earring that Basant possessed falls. He says it is evidence of his love. Priya bursts into tears. Basant is sent to jail for 7 years.