Amravathi, a naive girl, runs away from home and finds shelter in Arjun's house, who takes good care of her. However, when Arjun falls in love with Amravathi, her life takes a turn.

In 2122 AD, when the world faces an imminent threat from a rogue nation, Indrani, a formidable superwoman working for the Indian Super Force (ISF), must travel back in time to find a decisive action to thwart this nefarious scheme.

Nachiappan College is considered to be one of the worst college of Chennai; everyday violence erupts between two final-year groups. The students are influenced by the local bigwig Beeda Settu, who sells ganja to the students and basically rules the college from outside. The first group is led by Sudhakar whereas the other one is led by Kalaiarasan. The college management and the police get tired of that situation. They decide that they need to change the principal. The vice-president, Chandran, dies to sit in that post but the college management asks the successful Shanmugasundaram to take the post. His daughter Shobana will study in the same college. The rest of the story is how Shanmugasundaram succeeds in his mission.

Ganesh (Selva), a good-for-nothing youth, falls in love with Aishwarya (Monica Nerukkar). Her father Karnal Rajappa (Rajan P. Dev) is a very strict father who hates love. Ganesh and Aishwarya decide to elope but her father later has a heart attack and Aishwarya refuses to marry him. Karnal Rajappa's state of health deteriorates, therefore he arranges his daughter's wedding as soon as possible. Three terrorists (Sathya Prakash, Mahanadi Shankar and Bhanu Prakash) escape from jail. While preparing Aishwarya's wedding in Karnal Rajappa's house, Ganesh enters in her room and tries to convince her. In the meantime, the three terrorists enter in their house and begin to sequester them. These terrorists are ultimately Ganesh's friends and it was Ganesh's plan to marry his lover Aishwarya. What transpires later forms the crux of the story.

A young female terrorist goes on a suicide assassination mission, but her resolve to complete it is put to the test.