A doctor invents a drug which cause split personality disorder , to take revenge of his uncle's death.

Nalla Thanka , the only sister of Nallannan , the King of Madhurapuri, is wedded to Somanathan , the king of the neighbouring kingdom Ratnapuri. Alankari, the wicked wife of Nallannan becomes envious of the prosperity of Ratnapuri and the happy married life of Nalla Thanka.

Sashidharan, the graduate son of the landlord Panikker falls in love with Vilasini, the daughter of a poor widow Kalyani Amma . A crooked local newspaper editor and the lecherous city wastrel Rajasekharan form a tricky plot turning Panikker against his sons wish to marry Vilasini.