Rinka Hokazono, a 15-year-old student at Shimano Gakuen, balances her disciplined life as heir to the Shieikan Dojo with the complexities of adolescence. Her striking violet hair and piercing blue eyes contrast her unassuming demeanor, marked by a polite, almost exaggerated humility. A prodigy of the Ousou swordsmanship style, she once instructed her junior high kendo club and now trains with specialized equipment near the school gym—dangerous machinery only she can handle.

Though her physical prowess, honed through years of rigorous practice, allows her to effortlessly neutralize threats, Rinka stumbles in casual social settings. She studies shoujo manga to navigate conversations, borrowing scripted phrases for romantic or everyday interactions. Her solitary dedication to mastering Ousou demands a training partner, a requirement complicating her preference for solitude.

A past tragedy lingers in the loss of her older sister, though specifics remain unspoken. Her life intertwines with Nami Sato, a girl whose intense attachment stems from Rinka’s heroic intervention. While Nami’s clinginess tests her patience, Rinka tolerates it, prioritizing martial discipline over confrontation. This tension underscores her broader struggle: excelling in structured combat yet faltering in life’s unstructured moments, where social cues and spontaneity defy the order she relies on.