Yukino Tachibana, a high school student from a family renowned for their traditional dojo, dedicates herself to mastering the "Tachibana-style" swordsmanship. Following the tragic loss of her father—a master of the style—and her brother in an accident, she shoulders the duty of preserving her family’s martial legacy. Her grandfather, Souichi Tachibana, becomes a guiding force, urging her to seek innovative ways to honor their heritage beyond the dojo’s confines.

Yukino possesses long black hair, deep blue eyes, and a slender frame. Her attire—a black top, gray skirt, black stockings, and brown shoes—mirrors her disciplined yet poised nature. Though deeply committed to familial obligations, she grapples with reconciling these expectations with her personal ambitions. Overcoming hesitation, she joins the idol group RISE, realizing its hyper-sports platform allows her to reinterpret her swordsmanship expertise as a contemporary tribute to her lineage.

Within RISE, Yukino integrates kendo techniques and strategic insight into high-stakes competitions enhanced by cutting-edge athletic gear. Her meticulous precision and tactical adaptability become instrumental in securing victories, such as the Kanagawa tournament. This journey fosters her evolution from a solitary practitioner to a collaborative teammate, bridging centuries-old traditions with modern challenges.

Her given name, blending "snow" (雪) and "from" (乃), alongside the surname "Tachibana" (橘), meaning "citrus," reflects a cultural homage to nature and ancestral ties.