Kanna Laddu Thinna Aasaiya revolves around three friends who fall for the same girl.
The three friends Kaliyaperumal (Santhanam), Power Kumar (Srinivasan) and Shiva (Sethu)are unemployed and have no other work than getting drunk and chasing girls.
Three of them fall for the same girl Sowmiya who has just relocated to their locality. They make an agreement to let the girl choose her lover. To impress her, the three attempt three different methods.
Who will be the luckiest one? Will Soumiya really accept one out of them?