Nammal movie forms the basis of campus movies but deals with deep friendships, sacrifices and a mother son relationship. Shyam (Siddharth) and Sivan (Jishnu) are thick friends who are very popular in college. They are fun to be with and mischievous, and have a lot of friends. Their friends believe that they are rich kids whose parents are abroad except one (noolunda) who knows the truth. Contrary to their belief Shyam and Sivan are really orphans who attend college during the day and work for a living in the night. Their guardian is Balachandra Menon who is in charge of the orphanage.
Snehalatha ( Suhasini ) takes charge as the new principal in the college. Arpana ( Renuka Menon), another student who was in school together with Siddharth and had a soft corner for him, joins college. She is ragged by the mischievous duo. She complains to Suhasini who happens to be her mothers friend. Suhasini warns the boys but later when she comes to know of their real demeanor she feels sorry for them and takes special interest in them. The boys become close to her and then their guardian reveals to them that one of them is her own son.
Who is the real one? .. the rest of the story deals with the orphan's curiosity and their yearning to belong to somebody and the deepness of their friendship.