Suspenseful and scintillating, this fast-paced comedy starts with two scenes, one in 1981, in which a husband is waiting for his flirtatious wife to come home and take care of their son and baby daughter. The wife comes with her boyfriend and after a fight decides to leave the husband and child.
Again in flashback, in 1996, its college day festival and after a dance performance, Indu (Padmapriya) comes to enquire about her sister Lakshmi (Meera Nandan), who is with her four friends and one of them says he would drop her home.
The friends are having a good time enjoying the college day festival. In a sudden and shocking turn of events, there is a loud scream and all the students rush out to see what happened, only to find Lakshmi dead.
Present Day, out of the four friends Rex Immanuel (Kunchacko Boban), Philip Idikkula (Biju Menon), and Rashid Munna (Manoj K. Jayan), are excited to know about the return of Pappu alias Padmanabhan (Jayaram), who was accused and spent time in jail for the murder of Lakshmi. The four friends decide to get back to their studies, after a gap of 12 years.
Now back from Jail, Pappu wants to start everything from where he was forced to leave things, and the other three support him, taking a break from their jobs and joining the college for M.A Philosophy. To Pappu's initial shock, Indu (Padmapriya) the elder sister of Lakshmi, whom he was accused of murdering, is a lecturer in the college.
Following certain hilarious sequences of the foursome in college, there are some interesting twists and turns to the plot, but Pappu's main aim is to find the deep mystery behind the tragedy that happened 12 years ago and to find the real killer, whom he suspects, is one amongst his friends. Also, the question remains, how will the relationship between Indu and Pappu evolve?