Kalakalappu is a story of two brothers and their quest to save their cafe. Cheenu manages the cafe while Raghu is in prison. Cheenu's cafe fails the health inspector Madhavi's test and is given a month's notice to improve things.
Raghu, after being released from prison joins his brother to manage the cafe and conceptualizes innovative ways to make the cafe profitable. Raghu falls in love with the chef's daughter Shalini, while Cheenu and Madhavi fall in love as well. Meanwhile, a rogue police inspector cheats Raghu and takes over the cafe while Cheenu is away to Madhavi's village.
The rest of the story is about how Cheenu & Raghu manage to get their cafe back.