Prabhavathi aka Prabha is a feisty, independent woman who makes documentaries. She lives with her two filmmaking friends, but later moves in with her future mother-in-law Gomatha Silkurayappan aka Goms, when her son leaves for a job overseas. Goms is now a retired teacher, tutoring local kids in her home. Prabha learns that Goms misses her school friends Subbulakshmi Mangalamoorthy aka Subbu and Rani Amirthakumari Gothandaraman, with whom she has lost contact for nearly 40 years. In flashbacks, it is revealed that the three friends met while studying at a Catholic hostel during their high school days. They lost contact after Subbu and Rani were expelled following the three girls’ attempt to sneak out and go to a movie at night. The headmistress expelled only Subbu and Rani as they were not native to Tamil Nadu like Goms.

Hearing her story, Prabha becomes determined to reunite Goms with her friends. She uses Facebook to find Rani and succeeds. It is revealed that Rani is living in Agra with her blended family. Prabha abandons her plans to film in Chhattisgarh and instead takes Goms to Agra to reunite with Rani. Rani‘s life is very complicated, with a misogynistic husband Gothandaraman and son Karthi who are obsessed with politics. Subbu is living in Hyderabad with her drunkard husband Mangalamoorthy and his bedridden mother. She aspires to be a beautician, but her family life has prevented her from achieving her dream.

Once Goms, Rani and Subbu are reunited, Prabha takes them on a three-day "Ladies Only" tour throughout North India so they can escape from their shackled lives. Throughout the journey, Prabha helps the trio reminisce about their younger days, reassert themselves and embrace their newly found freedom.

At the end of the journey, Goms, Rani and Subbu are treated to a special anniversary screening of Aval Appadithan, the film they watched together on its first day: 30 October 1978. In the epilogue, each of the friends are empowered to take charge of and live life on their own terms with renewed assertiveness and satisfaction.