Mansaram is shocked to see Radhika sporting vermilion and wearing a 'mangalsutra'. Before Radhika can say anything, Barkha spills the beans and tells Mansaram that it was Radhika, and not her, who had married Dev. Mansaram is elated and tells Radhika that finally her faith has borne fruits as she is united with her childhood husband. Raj Purohit and everyone else are shocked to know that Radhika and Dev were married in their childhood on the auspicious occasion of 'Radhashtami'. Barkha too tells Raj Purohit that she was aware of this fact, but Radhika forbade her from disclosing the secret. Raj Purohit is shocked to know the truth and, all of a sudden, suffers a massive heart attack. Everyone is shocked. Later, Raj Purohit regains consciousness and expresses his desire to have a word with Radhika in private. Everyone leaves the room and Raj Purohit asks Radhika to promise him that she will help Dev become an ideal royal priest and will take utmost care to maintain the integrity of the royal priest. Radhika assures him that she will try her best. Before Radhika can say anything else, Raj Purohit breathes his last. Radhika is shocked to know that Raj Purohit is no more. Soon, everyone arrives and is taken aback, while Dev is shattered with the sudden demise of Raj Purohit.
Choti Bahu is the love saga of two soul mates Dev and Radhika.
Radhika, a Brahmin by birth, was adopted and brought up by a family of weavers in a small town called Rawal. Dev, whose family has been in the service of Rajpurohits for generations, visits Rawal as a child on the occasion of Radhashtami. Dev and Radhika meet each other and become good friends. Radhika and Dev's families tie them in the bond of marriage in their tender age.
Maheshwari (played by Pragati Mehra), the eldest bahu of the Purohits, hopes to inherit Dadaji's property. However, her plans hit a snag when Maheshwari realizes that Dadji has willed all his property is in the name of Choti Bahu.
Undeterred, Maheshwari decides to find a docile girl for Rohan (played by Apurva Agnihotri). Maheshwari plans to own the property by controlling and manipulating the Choti Bahu and to this end chooses Radhika for Rohan. Destiny brings Dev and Radhika together after 15 years, when he returns to Rawal after 15 years to find out about Radhika, Rohan's bride.
Will Dev recognize Radhika? Will Radhika marry Dev or Rohan? Will Radhika become the Choti Bahu of Purohit House?