In episode 3 of Mashle, the story continues with Mash Burnedead's magical school life, even though he himself cannot use magic. The focus of the episode is on Mash's struggles in the broom rider course and his encounters with Lloyd Cavill, a feared student with connections to the powerful Bureau of Magic.

During a broom rider class, Mash's inability to use magic becomes evident as he struggles to make his broom fly. His classmates mock him for his lack of magical abilities. However, Mash turns the tables when he challenges one of them to a broom race and sets a new world record by creatively throwing his broom and jumping onto it mid-air. This impressive feat catches the attention of the sinister Lloyd Cavill, who attempts to befriend Mash while secretly plotting against him.

Lloyd manipulates Mash's roommate Finn into sabotaging Mash's textbooks and other belongings, pushing Finn to the brink of despair. Finn eventually confesses his actions to Mash, leading to a confrontation between Mash and Lloyd. Mash stands up for Finn and defies both Lloyd and the corrupt vice principal Farman. Through this, Mash earns the respect and admiration of his classmates.

Mash's decision to stand up against the powerful and corrupt resonates with the school principal, who acknowledges the importance of individuals like Mash in a world dominated by power and authority. He encourages Mash to become a divine visionary to bring change to the world, despite the many obstacles he must face.

The episode ends with Mash being recruited by an awkward but enthusiastic student, Tom Knowles, to represent their dormitory in a duel—a popular sport in the magical realm played on brooms. Although Mash still can't properly ride a broom, he is determined to find a way to succeed and continue pursuing his goal of becoming a divine visionary.