Vasanth, son of an MP, falls in love with Heena. But Heena seems to be the main suspect for a bomb attack on his father. Vasanth secretly helps her return to Kolkata and soon follows to meet her.

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.

Family opposition to a couple’s coming together forms the basis for this standard love story.