Kaakha Kaakha movie is all about Anbuchelvan (Surya) who is part of a group of four police officers who work battling organized crime in Chennai. Violent and laconic, he finds little patience for a personal life, until he turns hero in the eyes of schoolteacher Maya (Jyothika), and embarks on a little romance. Meanwhile, his squad kills the brother of a reckless criminal Pandya (Jeevan), but fails to wipe off the entire gang. Pandya's hoodlums then take the battle into the homes of the officers, going after their family members one by one. It all ends with the demise of Pandya and his gang in the hands of Anbuchelvan.
An epilogue shows that Anbuchelvan, after the death of Maya, continues his job as an IPS officer some weeks later. An alternate ending was shot and placed in the DVD version with a running commentary by Gautham Menon, in which he explained why the idea of this ending was dropped.