Nattukku Oru Nallavan is the story of an honest police officer (Rajinikanth) and his fight against a dreaded criminal named Dddy (Anant Nag) who indulges in organ transplant mafia.

Vasanth (Prashanth), a rich guy meets a girl (Simran) in Coimbatore railway station while travelling to Chennai to join engineering and it is love at first sight for Vasanth. Shankar (Karan) also studies in same college where Vasanth joins and initially both Vasanth and Shankar develop clashes. Priya (Simran) is the sister of Shankar and without knowing that Vasanth meets Priya on a few more situations in Chennai and conveys his love towards her but Priya does not reciprocate and keeps distance with Vasanth.
One day, Vasanth saves Shankar’s life from a few thugs and this makes the two get close to each other. Shankar’s mother Srividya does not like any of Shankar’s friends visiting their home and once insults Vasanth when Shankar has invited Vasanth to his home. Later on Srividya gets to know about Vasanth’s good character and apologizes to him and also invites to their home. Now Vasanth comes to know that Priya is Shankar’s sister and feels bad that he is in love with his best friend’s sister.

Majnu (Tamil: மஜ்னு) is a Tamil-language Romance film which is Directed by Ravichandran & performed by Prashanth, Rinke Khanna, Rati Agnihotri on and Released 21 December 2001.