The Bharadwaj and Rajpurohit families rush to Ruby's room and panic when they fail to find her in the room. Jolly states that Ruby was in her room only a while back. The families are puzzled and wonder where Ruby was. At that time, Mohini gets scared and screams out loud. The family rushes to help Mohini and too gets scared when they see Ruby, who is possessed by a spirit, floating in the air. When Hrishikesh moves towards Ruby, Dev stops him. The spirit in a stern voice tells the families that Radhika can never save Ruby's life. The spirit also threatens to kill Radhika. The families get worried when the spirit tries to strangle Dev. Meanwhile, Radhika arrives and manages to save Dev. Ruby falls down exasperated. Radhika informs the families that she has brought the charnamrit from the cave in order to ward off the spirit possessing Ruby. When Radhika offers the charnamrit to Ruby, the spirit once again enters her body. Ruby pushes aside the container and again floats in the air. The spirit threatens to kill Ruby. A possessed Ruby starts hurting herself with a knife. Ruby is about to stab herself to death when Radhika starts chanting mantras to ward off the spirit. Radhika succeeds and the spirit gets released. Ruby falls down unconscious. A while later after Ruby regains consciousness she thanks Radhika for saving her. She apologizes to Radhika and lovingly calls RB her father. Minutes later, Ruby breathes her last. While everyone mourns Ruby's death, Radhika refuses to believe that Ruby was dead. Radhika asks Dev to follow her instructions so that she can save Ruby.
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?