The story of Brahmotsavam is quite simple and is based on Satyaraj and his joint family. But one among the family, Rao Ramesh is always unhappy with the way he is always under the shadow of Satyaraj. To get even more prominence in the family, he decides to get his daughter(Pranitha) married to Mahesh Babu who is Satyaraj's son.Twist in the tale arises when Rao Ramesh finds out that Mahesh is already in love with Kajal. He bursts out with anger and confronts Satyaraj. An unexpected incident takes place because of this issue and disrupts the entire family. Rest of the story is as to how Mahesh takes things in hand and gets his family back on track and where does Samantha feature in all this set up.