Velu Prabhakaran aims to make a film based on the incidents that have happened in his life starting with a girl he had fallen in love with believing he would spend the rest of his life and even having a physical relationship with her. In his hopes to make a film, he heads to Chennai and comes to know few days later that the girl he loved has married someone else. He then goes back to see her with much pain in his heart. After this, he decides he does want to get married to anyone and that is when he comes across Pon Swathi as actress Vijaya, who is a Bharathanatyam dancer and already in a relationship with her dance master. Sometime later, he comes to hear wrong things about Vijaya and he decides to leave her. He then marries Vijaya's elder brother's daughter and gets separated from her too. He comes to the conclusion that lust is the determining fact when it comes to love and women and he expresses his views about it. Pon Swathi too falls for him once again and the remainder of the plot revolves around what decision Velu Prabhakaran has come to regarding his relationship with her and what all changes take place in his life.
Be it as a youngster or in his present age, Velu Prabhakaran has exhibited fine skills in acting and the same can be said about Pon Swathi, who appears in the same manner. She has acted accordingly to the director's demands and so have the other actors in the film.
Velu Prabhakaran stresses that women fall prey to anti-social elements' ill thoughts as they keep themselves under a veil most of the time and should be more open in the society. Such feelings need to be spoken as they are and the topic of lust shouldn't be taboo anymore. Men are still reigning over women and that should change. Even a woman who would hold a high position would have to lie at her husband's feet and act accordingly to his instructions is what the filmmaker has attempted to say with the film. Despite saying that many portions in the film are his real life experiences, he has further added there are many things that remain unrevealed. And, for a bold attempt as this, he deserves praises. Although Ilaiyaraaja's songs are average, the background score is not up to the mark. Manikandan's cinematography skills come to the fore, but there is hardly anything worth mentioning as exceptional.
In short, Oru Iyakkunarin Kadhal Diary has still a lot more that can be written.