Njangal Santhushtaranu movie revolves around a young couple Sanjeevan (Jayaram)and Gitu (Abhrami) happy married life seems to be at arms length. However their different personalities clash and find themselves up in arms over simple things. An escalating battle of the axes ensues as Sanjeevan and Gitu continue to live under the same roof while cooking up schemes to expose each others personalities to their friends and families.
Movie takes a wild turn when Gitu's true past gets revealed. Salperu Sathanandhan(Jagathy) add spice to this comedy with his two wives and seven children.