Damu is the member of a middle-class joint family consisting of his parents, a married brother along with his wife and an unmarried sister.
Theirs is a typically happy family but there is one closely held secret, which no one outside the family knows about. Every evening after 6 pm Damu’s personality transforms into that of his late grandfather, Shrimant Damodar Pant.
While Damu himself is a simple and obedient young man, Shrimant has a very dominant personality. He is so strict that every member of the family including Damu’s father is afraid of him.
This kind of change in Damu creates a totally different dynamic in the family, causing lots of dicey situations for one and all. The family's hilarious attempts to deal with the contrasting personalities of Damu and Shrimant Damodar Pant forms the crux of the movie.