Oru Kidayin Karunai Manu promises a hilarious comedy drama featuring a newlywed couple, a God-fearing grandmother, their families and a goat! The film focuses on Ramamoorthy, a middle aged groom who finally choose a girl to settle down with despite the age gap. Overwhelmed with happiness, his grandmother reveals that they must sacrifice a goat immediately considering she had made a promise to God and delaying which, might prove catastrophic! Driven by fear of superstitions, the entire family sets on a road trip that soon turns into a comical caper full of chaos! Was the goat sacrificed? Was the promise fulfilled?