Set in Vrindavan, Choti Bahu focuses on the trials and tribulations and sacrifices of Radhika, the youngest daughter-in-law of the Purohit family and the adopted daughter of Vrindavan's Shastri. she was married to Dev Raj Purohit but later Vishakha was send with dev as her wife. Vishaka wants her carrier in film industry, so she leaves dev. Dev again marries to Radhika as his second wife. Later the truth is opened by Radhika that she is Devs first wife, when Vishaka returns and laid a condition in front of dev to spend one night with her. Vishaka's mother Devki opened this truth in front of Purohit family.