Diya Aur Baati Hum : is the story of Sandhya as she trains as an Indian Police Service officer. She dreams of breaking the boundaries of her confined existence of middleclass values. The story is also about Sooraj, who is a self-made man. Sooraj owns a famous sweet shop near his house. Sooraj and Sandhya get married under strained circumstances. Sandhya struggles with her strict mother in law who does not accept that her daughter in law could become a police officer. The story shows how her husband becomes her strength and helps her to fulfil her dreams. Sandhya went to an 11 month training and completed missions and tasks. Sandhya is an IPS now. later on Sandhya got stuck between work and family. Sandhya got de promoted later on and had to win 3 medal to get her position back. Sandhya's family supports her for it. Two terrorists come to Sandhya's house disguised as a simple poor woman and Sooraj's helper. They mislead Sooraj and others that Sooraj has to go to Dubai, so everyone makes preparations to go to Dubai. Chaturi, Bhabo and Sooraj go to Dubai but their flight gets hijacked by Disha Sooraj's helper, Prema and their head called Baiji(Maya), Rajkumar's sister. The hijackers demand Rajkumar's freedom. Sandhya manages to capture them with the help of Zakir and Arjun. Sandhya kills Disha while Arjun kills Prema by shooting on her back. Zakir kills Maya by shooting her in the chest & back. Unfortunately, Bhabo gets shot while she was saving Sooraj. Baba Sa blames Sandhya for all this while Sandhya and Zakir get praised all over the country. Bhabo's one kidney gets damaged but she is safe and comes back home. Sooraj also thinks that Sandhya has done the wrong thing and does not treat Bhabo as his mother. He removes Sandhya out of the Rathi house. Bhabo is shocked by Sooraj's decision. Ankur and Ankita take Sandhya to their home. Bhabo makes attempts to reunite Sooraj and Sandhya but fails. Sandhya receives orders to go to Scotland for training. Sandhya with heavy heart decides to go so that Sooraj can stay happy. Meanwhile, Bhabo's health deteriorates and the other kidney also gets damaged. Doctor tells that Bhabo needs kidneys and her kidney transplant must be done immediately. Sooraj and family arrange for a kidney but Sooraj comes to know that the lady who is going to donate a kidney to Bhabo is not doing willingly and her husband was forcing her to do so because of the money. Sooraj saves that woman and refuses to take her kidney. The entire family says that he must have thought of Bhabo before doing this. At this point, Bhabo explains to Sooraj that he thought of humanity first and saved the woman, in the same way Sandhya thought of saving all the passengers and the country first as if the terrorists would be alive then they would kill lakhs of people. Hearing this, Sooraj and Rathi family realize their mistake. A secret donor donates her kidney to Bhabo. On Republic Day, Sandhya receives an award for her bravery. Sooraj goes to take the award on behalf of Sandhya and apologizes to Sandhya in front of everyone. Sandhya sees this function on TV and goes to meet Sooraj. Sooraj apologizes to Sandhya and brings her back home. Sandhya, after returning to Rathi house is sad and tries to stay away from Sooraj. Ankur plans a trip for Rathi family to Mumbai. In Mumbai, Sooraj notices Sandhya's behaviour and thinks that she is hiding something from him. Then he comes to know that the person who donated a kidney to Bhabo is none other than Sandhya. Sandhya gets Sooraj to promise to her that he will not reveal this to the rest of the Rathi family. Bhabo tells Sooraj and Sandhya to now think of their child. After returning to Pushkar, Sandhya comes to know that she is pregnant. On Holi, Sandhya eats laddoo of Bhang and reveals that she is pregnant. Rathi family rejoices and Bhabo takes extra care of Sandhya. But to everyone's worry, Sandhya develops the disease of sleep-walking and at one night was to fall from the terrace cliff but Sooraj saves her. Bhabo and Sooraj are worried about her condition. Sandhya's doctor reveals that she is going to give birth to twin babies. On Ankur's request, Rathi family moves to his house as his house is safer for Sandhya. Ankur's wife got miss carriage and lose her baby accidentally. There Sandhya's niece Bulbul tries to please Sandhya and Sooraj for giving one of their babies to her after the birth of those babies. Sooraj and Sandhya were not ready to give so they disagree. After that Bulbul develops a high fever. So to console her, her dad agrees to adopt a child. But the orphanage people disagree to give her approval for a request of baby. After that Sooraj thinks very deeply about the request of Bulbul and he decides that he will give one baby to her. Sandhya also agrees with him, but suddenly Bhabo hears their decision and tries to protest. But that time Bulbul comes and in front of Bhabo she pleads for a baby but she disagrees. Bhabo tells to Bulbul that few things we can't share it with each other. Then Bulbul tells Bhabo that Sandhya has given kidney to Bhabo. To return the favour of her kidney, Bhabo agrees to give her grandson. After that Sandhya's delivery date comes and Sandhya delivers two sons. The namkarn ceremony happens after her delivery and Bulbul's mom names her baby as Vansh and Sooraj's sister names the other baby has Ved. After that Sandhya gives the baby to Ankur. After a few days, both of Sandhya's babies go missing. After finding both of them Sandhya hugs them tightly. Ankur felt insulted that Vansh is their baby but still Sandhya hugs him first. Due to this misunderstanding, they gets separated.