The Story is about Ramachandran a genetic scientist who doesn't get due credit and funds for his research. He tries creating a human with several talents through baby designing, which thus leads to the birth of his sons, who are conjoined together above the waist. Since they share a common heart, doctors suggest a sacrificial surgery, to which their mother Sudha objects. They begin raising their children, Vimalan and Akhilan. In the following years, Ramachandran makes it big with the help of Sudha. His company, Locus Lacto Products, makes huge profit through their product "Energion", the top-selling children's powdered milk energy drink in the market. Vimalan and Akhilan are poles apart in character, the former being decent and good at studies while the latter is care-free and poor at studies. Anjali joins their company as a translator. Both Vimalan and Akhilan fall for her. She, along with her Russian friend Volga, a journalist, spend their time with the brothers. Meanwhile, Anjali falls for Vimalan and Akhilan is happy for them. Volga is then revealed to be a spy who tries to steal the trade secrets of Energion. She is exposed and sent out by Ramachandran. She then takes the brothers to their cattle farm under the pretext of an interview where she takes pictures and even collects a milk sample from their farm. When Vimalan questions her, he is warned by her that Energion was an adulterated product and could lead to the death of thousands of children. She also exposes their father of killing the head of their R & D department and setting the lab on fire, thereby destroying evidence. Consequently, she is murdered, but, she swallows a pen-drive containing evidences of the foul-play before dying. Anjali acquires it from the person who performs Volga's autopsy. She hands the pen-drive over to Vimalan. Following this, Vimalan and Akhilan are confronted by goons who try to get the pen-drive from him. Akhilan is convinced that the attack was only meant for robbing them. During this fight, Vimalan suffers a huge blow on the head. Vimalan is declared brain-dead and his heart is transplanted into Akhilan. After the twins are separated through a surgery, Anjali grows closer to Akhilan. Sudha is warned that Energion is adulterated and she confronts her husband who asks the food safety department to raid their company. But to her surprise, Energion is declared safe and hygienic.
