Story revolves around two characters, Shreya and Sidharth. Shreya is an architect, and she broke her engagement when she knew that her boyfriend was cheating on her. Sidharth is a structural engineer who wasn’t a strong believer in the institution of marriage, and he was very clear that he didn’t want kids. At one point, Shreya, who is now single, decides to have a kid through IVF, and because of Sidharth’s no-kids policy, his girlfriend also left him. What we see in Kadhalikka Neramillai is the events that unfold in the lives of these two when they cross paths.