Yumina Ishida is a japanese highschooler, who doubles as a martial heroine during the night. Yumina has spent years practicing martial arts, and after becoming a master she quickly became bored by the lack of real application. Spurred on by a wish to change the world for the better, she turned to vigilantism, apprehending criminals with a martial trance, dancing around and landing stunningly powerful kicks and punches. Yumina now sees herself as the heroine of the city, despite her night activities going unrecognized by most people. She has long black hair that flows down to her upper body, and inquisitive purple eyes. As a schoolgirl, Yumina is quiet, and keeps to herself and her studies. As a heroine, she acts fierce, and always stays serious.