Agnishikha is the story of Abhimanyu who was deprived of his father's identity as he deserted his mother to marry a rich man's daughter. He vows to take revenge against Arjun Roy, his father. He befriends him and then ruins his business and family life. But the sisterly love of Rina, Arjun's daughter from his other wife changes his heart. He helps Rina leave her father's house so that she doesn't have to marry Bobby, the son of Sikdar, Arjun's enemy. Arjun explains to Jyoti how his father had made him believe that Jyoti is dead. The misunderstandings are resolved. Sikdar is arrested. Arjun Roy's family is happily united.