Naanu Nanna Kanasu is the depiction of a father’s narration of his own coming-of-age, with the birth and growth of his daughter. It is a remake of tamil movie, “Abhiyum Naanum”.
Uthappa (Prakash Raj), who encounters a chance to meet a young father Jayanth (Ramesh Aravind) and his daughter, on his morning walk. As they introduce themselves to each other, going past the hilarity of the nature of their rendezvous Uthappa begins to narrate to Jayanth how it was to bring up his own daughter, Kanasu (Amoolya).
Sharing the better half of this journey of Uthappa’s, is his wife and soulmate Kalpana (Sithara) who is seen to be the saner voice in the Uthappa household. Being quite literally, a letter from a father to a daughter, the story stands testament to the oft-quoted "When a child is born, a father is born as well".