"Maji de Otaku na English! Ribbon-chan: Eigo de Tatakau Mahō Shōjo the TV" centers on Ribbon-chan, a magical girl who fights to protect the world from the forces of darkness using the power of English language. The series blends elements of magical girl tropes with educational themes, aiming to teach basic English phrases and vocabulary through its narrative. Ribbon-chan, the protagonist, is a cheerful and determined character who transforms into her magical form to combat evil entities known as the "Dark English Corps," who seek to spread confusion and chaos by distorting language.

The Dark English Corps, led by the enigmatic Grammarian, employs monsters called "Engloids" that disrupt communication and understanding among people. Ribbon-chan, armed with her magical ribbon and a talking textbook named Mr. Dictionary, confronts these threats by using correct English phrases and grammar to purify the Engloids and restore order. Each episode typically features a specific English lesson, often tied to the conflict of the week, making the series both entertaining and instructional.

Supporting characters include Ribbon-chan’s classmates and friends, who occasionally assist her in battles or provide moral support. The series also introduces rival magical girls and allies who share Ribbon-chan’s mission, adding depth to the narrative. The episodic structure allows for a mix of standalone adventures and overarching plotlines, with the Grammarian’s schemes growing increasingly complex as the series progresses.

Themes of perseverance, teamwork, and the importance of communication are woven throughout the story, with Ribbon-chan’s growth as a magical girl paralleling her mastery of English. The series strikes a balance between lighthearted humor, action-packed battles, and educational content, making it accessible to a younger audience while offering a unique twist on the magical girl genre.