Sakurako Miyagawa reigns as the narrative's primary rival and antagonist—a 21-year-old professional kickboxer determined to uphold her status as women's kickboxing undisputed champion. Towering with a slim physique, her long blonde hair cascades in a high ponytail, complementing a wardrobe of lavish, trendsetting outfits that flaunt her affluent stature.

A volatile blend of competitiveness, jealousy, and self-absorption defines her. When a rising star captures the spotlight with a single triumph, Sakurako's simmering resentment erupts into a direct confrontation at the newcomer's school, where she issues a formal challenge. This feud burns from her dread of obscurity and an unrelenting drive to crush any threat to her supremacy.

In her cutting-edge training sanctum, she hones every strike and maneuver into lethal precision. The ensuing clash showcases her strategic brilliance—evading and parrying blows with calculated grace while retaliating with punishing force. Yet victory slips through her fingers when an abrupt injury halts the match, igniting white-hot fury. This bitter setback cements her vendetta, forging an iron resolve to dominate in a decisive rematch.

Sakurako's existence orbits entirely around her championship aspirations and rivalries, every action fueling high-stakes athletic drama. She embodies the ruthless pursuit of glory, her confrontations serving as battlegrounds where pride and ambition collide.