Kodiveeran story is about Sasikumar is a lovable brother to Sanusha. Similarly, Pasupathy is a caring brother to Poorna. Sasi and Sanusha lost their mother at a young age. So, they care themselves and are bonded well. Sasikumar could not tolerate any negative words about his sister. He is ready to shed his blood for her. Sanusha is married to Vidharth. Vidharth is a government officer. When Vidharth faces a tough situation from Pasupathy and his brother-in-law, Sasikumar tries to save Vidharth from them. Did he save him? What happened to Sanusha? forms rest of the story.