The film stars Rocco Nacino, Carlo Aquino, Enzo Pineda and Kean Cipriano, and revolves around a group of friends who will try their best to become aspiring lawyers in a law school.

A quartet of friends consisting of legal management graduates Christian (Enzo Pineda), Erik Visencio (Carlo Aquino), Joshua (Kean Cipriano) and Toran Garcia (Rocco Nacino), play League of Legends in an internet café and later check the results of their law school entrance examination.

Erik is from a working-class family, with his father, an aging retired cop now working as a security guard, hoping the law degree will lift them out of poverty.

Christian comes from a wealthy family and could attend an Ivy League university in the U.S., but he chooses to study law in the Philippines to be closer to his girlfriend (Ana Luna), a decision his father (Pontri Bernardo), a Filipino-American lawyer and businessman, is unaware of.

Toran begins a relationship with a popular, intelligent girl in his class and is invited to join an elite law school fraternity after an altercation with a rival member.

One of their most challenging classes is taught by the strict Deputy Dean, retired Supreme Court Associate Justice Hernandez, who demands precise answers.

In one class, she teaches the students about the seriousness of studying law and shares a pro bono case she handled involving land titles and the oppression of farmers.

As Erik shares his plan to start a business, Hernandez supports him but encourages him to retake the bar exams, warning him about fraternity influences.

Writer-director Erik Matti described the film as "nostalgic and sentimental", saying that Bar Boys reminded him of Maryo J. de los Reyes's Bagets and Jake Tordesillas's High School Circa '65.