Prabhu(Prasanna), Ilango(Krishna), Sundar(Karthik), Priya and Indra are the best of friends at college, swearing to never lose touch with one another later in life. They manage to get jobs in the same company but Ilango, was whisked away to his village by his dictatorial father(Vijayan) and forced into marriage with Eeswari(Kanika). He then runs away while the friends assume that he is in Bombay with his new wife. A few years later the remaining four are still friends, working in the same company and even living in one house. Prabhu meets Eeswari on the train and without knowing that she is Ilango’s wife, falls in love with her. When the truth comes out she becomes good friends with the gang while they promise to find Ilango and reunite them.

A hospital administrator dies, and the cop investigating the murder finds that this is just one in a series of grisly crimes.

Kadir (Hemachandran) and Poonkothai (Nandana) are cotton mill workers in southern Tamil Nadu. Their affection grows into love but once the mill closes down following a strike, life gets hard for them and everyone working along with them.

Kodambakkam in this movie Sugavannan (Nandha), who is staying in village. Later he settles down in Chennai with the dream of becoming a director one-day. In his native, he falls in love with Dhanam (Diya), she motivates him in all the ways to achieve his dreams.

Sanju (Sundeep Kishan) is a college going student who falls for a girl Tanvi (Regina Cassandra) at first sight. They get along over a period of time but unsure of the advancing in their relationship because other person might not be perfect.

Guna (Kamal Haasan) is a mentally affected person and receives treatment in a mental hospital in Hyderabad. He does not like his father, and his mother Manonmani (S. Varalakshmi) is a moll in the house that they live. He assumes a fictitious character named Abirami (also the name of an Indian goddess) and registers in his mind that she is an angel who is going to marry him on a “full moon day”. After coming out of the asylum, he believes the story to be true and believes that his Abirami is somewhere around.
A bunch of hooligans led by Guna’s uncle (Janagaraj) trick Guna into robbing a temple of Abirami, an Indian goddess. He happens to see a rich girl (Roshini) in there, right after his uncle tells him that “Abirami will come”. He decides that she is the one, and in the confusion following the robbery, he takes her with him to a lonely, damaged house situated at the top of a hill in Kodaikanal. Police start investigation regarding the robbery and missing of Roshini. Initially, Roshini hates him for his weird nature and for holding her captive.

College classmates Ravi and Sandhya are in love with each other. But Sandhya’s cruel stepmother wants to marry her off to her uncle, a rowdy and will go to any extent to stop them.

The plot is woven around two central characters Paandithurai and Nayagam (both debutants) who detest each other and are at loggerheads all the time. The fathers of the respective youngsters remain friends through thick and thin. Things go haywire when Paandithurai feels Nayagam abducts the chairman post of the village from him. What follows is a series of feuds between two groups and how one tries to falter the other. Also involved in the plot is the romance between Paandithurai and Kayal (another debutant) who belongs to the Nayagam camp.

Two retired colonels are at loggerheads with each other because one of them had been a traitor to the country. The grandson of the traitor and the grand-daughter of the other colonel fall in love but have to surmount a number of obstacles, including the one created by the girl’s grandpa, before uniting in matrimony. There is also a Brahmin’s daughter who loves the coloned’s grandson. In the end, the Brahmin’s daughter sacrifices her life to save her beloved. The traitor colonel also atones for his treachery.

R. Parthiban plays a die hard fan of Rambha and a self-interest governed taxi driver whose name is never revealed throughout the movie. Meena plays Mahalakshimi, the daughter of a “zamindar” who has lost all his money due to financial troubles; his death leaves Mahalakshimi with a lot of debts (over two lakhs worth). Parthipan is the taxi driver that drives Meena’s dead father’s corpse back to her hometown. There, the people that Mahalakshimi is now indebted to by Anand Raj who torture Mahalakshimi with cruel words for being unable to pay the debt. Later Parthiban helps her out by giving his taxi in replace to Meena’s debt to save her at the point of time. But the twist in the movie is that Parthiban irritates Meena, though unwillingly, to get back his taxi as soon as possible. In the later part Meena will fall in love with Parthiban for his continuous help and support towards Meena. At that time Parthiban’s dream girl Actress Rambha comes for shooting in that palace, which makes Meena very angry and jealous as all his attention has been diverted to Rambha. At the end of shooting, Rambha tries to talk Parthiban and Meena and makes them realise their love for each other. But Meena never sees any sign of Parthiban loving her and thus accepts to marry the villain (Anand Raj’s) son to get back Parthiban’s taxi and settle her debt. Eventually, Parthiban realises his love for Meena and tries to stop the wedding as the groom is also a bad guy who cheated Manorama’s daughter. Finally the movie ends on a happy note with Meena getting back all her money and property and leading a happy life with Parthiban.

Vijay, a guy with a careless attitude, gets Selvam, a senior home inmate, to act as his dad for an important business deal. Gradually, both help each other through their own experiences and problems.

Oru Modhal Oru Kadhal is a story of a guy (Vivek Rajgopal), who falls in love with a girl, and their trouble-filled journey from Chennai to Bangalore to Delhi giving troubles to his friends and family portrayed hilariously.