Parthiban (Kathir) is the son of the late Jayakkodi Thevar (Muruganji), a powerful patriarch in Theni, one-day Parthiban accidentally kills the son of Veera Thevar, while he was trying to save his stepbrother. The rest of the story is all about how Veera Thevar wants to take avenge on Kathir by murdering him. Watch Madha Yaanai Koottam movie online.