"Infinite Stratos Encore: Sextet of Burning Love" is an OVA (original video animation) episode that serves as an extension of the "Infinite Stratos" series, a science fiction harem anime centered around the protagonist Ichika Orimura. The story is set in a world where the Infinite Stratos (IS), a powerful exoskeleton weapon, can only be piloted by women, making Ichika an anomaly as the sole male capable of operating one. The OVA continues the comedic and romantic dynamics established in the main series, focusing on the interactions between Ichika and the female characters who vie for his attention.

The narrative unfolds during a school festival at the IS Academy, where Ichika and his classmates participate in various activities. The central plot revolves around a play adaptation of "Cinderella," which the students are preparing to perform. Ichika is cast as the prince, while the main heroines—Houki Shinonono, Cecilia Alcott, Lingyin Huang, Charlotte Dunois, Laura Bodewig, and Tatenashi Sarashiki—compete for the role of Cinderella. This setup amplifies the series' signature harem elements, with each girl attempting to outshine the others to win Ichika's favor.

The OVA emphasizes lighthearted humor and romantic tension, with exaggerated scenarios and misunderstandings driving much of the plot. The heroines' distinct personalities and rivalries are highlighted, showcasing their determination to stand out both on and off the stage. The play itself becomes a chaotic yet entertaining spectacle, blending the characters' personal struggles with the whimsical nature of the festival.

Ichika remains his typical oblivious self, often unaware of the girls' feelings and the chaos his presence incites. The OVA does not significantly advance the overarching plot of the "Infinite Stratos" series but instead provides a self-contained, comedic episode that reinforces the relationships and dynamics between the characters. It serves as a continuation of the series' themes of competition, romance, and the challenges of being the only male in a female-dominated environment.