Mr. Brahmachari movie is about Ananthan Thampy (Mohanlal) who is a middle aged who has decided never to marry. He thinks he will loose all his youthfulness and pleasing looks by marriage. His main hobby is body building and he prefers to be a chronic bachelor.
His sister Nirmala(Bindu Panicker) and her husband Venugopalan(Jagathy) are happy about this decision eying on the huge properties of Thampi. But the fate has some other scenario for Ananthan Thampy.
The beautiful Ganga(Meena) and family comes to stay in neighborhood. Ananthan Thampy is nervous first and furious next.
One day a guy, Aravindan (VijayKumar) comes and pleads with Thampi for a job in his cable company. Thampi mistakes Aravindan to be Ganga's lover and promises him to help him marry her.