After having killed extortionist Mayil Vaaganam (Prakash Raj) in the first film, Durai Singam (Suriya) has gone undercover after meeting Home Minister Ramanathan (Vijayakumar) and is working as an NCC officer in a Thoothukudi school. The people who know about this operation are the Chief Minister (K. Viswanath) and Ramanathan. Sathya (Hansika Motwani) is a student who falls for Durai Singam, though he is waiting to marry his love interest Kavya (Anushka Shetty). Durai Singam's father Soundara Pandi (Radha Ravi) is angry about him leaving the police force. He also forbids the marriage between Durai Singam and Kavya. Susai (Santhanam), a local who works in the same school, shows Durai Singam parts of Thoothukudi and tells him about the happenings in those places. Durai Singam requests Ramanathan to transfer Erimalai (Vivek) and another cop to assist him. Durai Singam learns that Sathya is the niece of businessman Thangaraj (Rahman). Thangaraj and Bhai (Mukesh Rishi) are criminals who control the southeast coastline of Tamil Nadu. Bhai and Thangaraj have connections with an international gangster and drug lord Danny (Danny Sapani). Bhai's chief drug importer Saghayam (Rajendran) kidnaps a girl from another caste, holds her ransom until sunset, and releases her. This causes a problem in the city, and Durai Singam's school principal (Madhan Bob) has to close the school. Durai Singam takes charge as new DCP and rescues the girl. Later, at Durai Singam's engagement function, Harbour Shanmugam (Thyagu) informs him that Thangaraj has hired goons to attack his home at night and kill everyone. Durai Singam foils that plan. He then places a drug bag insides Thangaraj's house and jails him. However, on the next day, Durai Singam gets a phone call from someone to inform him that Sathya has died. He is rushed to Thangaraj's house and there finds Sathya lying dead. He analyzes that Sathya was killed by her own father (Thalaivasal Vijay), who poisoned her. Durai Singam goes to South Africa and arrests Danny.
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