Kadhalakku Maryadhai movie based only love story. Jeevanandhan (Vijay) meets Mini (Shalini) in a book shop and their eyes meet leading to sparks of love in their hearts. Mini has more affection with fer family. She is the apple of their eye. Mini is hesitant to reciprocate her love for Jeeva who steadily makes an inroad into her heart. Jeeva’s parents are under the impression that their son is pursuing his MBA studies until his father receives an SOS from Jeeva, injured in one such beatings.
His father Chandrasekhar (Sivakumar) is stunned by the developments and Jeeva’s mother (Srividya) is also shocked. Jeeva refuses to part company with Mini when his father arrives with his henchmen to take him back. The Christian family wants Jeeva dead. Hero's friends Realising that the lovers’ existence is in danger, Kesavan (Charlie) suggests that they find refuge in his father’s (Manivannan’s) fishermen hamlet and the couple elope followed by the brothers.
After the lovers learn of the unlimited love, affection and care their respective family members have for them and decide not to hurt their sentiments. They agree to part company. The fisherfolk leader is shocked first at their decision, and later understands their feelings and sends them back safely, an appreciable twist in the movie.