Kizuna Todoroki, having triumphed in the World Martial Arts Tournament and settling her grandfather's ¥100 million debt, draws the interest of an inquisitive journalist. The journalist is astounded by Kizuna's feat of defeating the reigning champion and proposes an interview featuring her and the Wadachi Ju-ken martial arts academy, which her grandfather operates. Regrettably, their conversation is constantly interrupted by a slew of challengers who aspire to claim Kizuna's championship title before she reaches 13. While Kizuna battles to preserve her title, the journalist explores the background of the Todoroki family.