"Samurai Girl Real Bout High School" is set in a near-future Japan where schools have adopted a dueling system to resolve conflicts and establish hierarchy. The story centers around Ryoko Mitsurugi, a skilled swordswoman and transfer student at Hakuoh High School, a prestigious institution where students engage in armed combat using advanced technology. The duels, known as "Real Bout," are regulated by the school and serve as a means to settle disputes, gain status, and protect personal honor.

Ryoko, who wields a high-tech sword called the "Mugen Tenshin," quickly becomes a prominent figure at Hakuoh due to her exceptional combat abilities and strong sense of justice. Her arrival disrupts the existing power dynamics, particularly challenging the dominance of the school's elite fighters. Among them is Shizuma Kusanagi, a top duelist with a mysterious past and a connection to Ryoko's family. Their rivalry evolves into a complex relationship as they uncover shared secrets and confront external threats.

The narrative explores themes of honor, loyalty, and the consequences of violence, as Ryoko navigates the competitive and often dangerous environment of Hakuoh. The school's dueling system is revealed to be part of a larger, more sinister agenda orchestrated by powerful figures seeking to exploit the students for their own purposes. As Ryoko and her allies uncover the truth, they must confront not only their opponents in the arena but also the corrupt forces manipulating events behind the scenes.

Supporting characters include Ichiro Tohya, a skilled mechanic and Ryoko's childhood friend, who provides technical support and emotional grounding. Aoi Mizuhara, a fellow student and duelist, serves as both a rival and ally, adding depth to the interpersonal dynamics. The series blends action, drama, and elements of science fiction, creating a narrative that balances intense combat sequences with character-driven storytelling. The interplay between personal ambition, institutional corruption, and the pursuit of justice drives the plot forward, culminating in a climactic confrontation that challenges the characters' values and resolves key conflicts.