Ryunmei Ranka is a martial arts expert traversing the continent to hone her unarmed combat skills under seasoned masters. Funding her journey through pragmatic ventures, she fights incognito in arenas after discovering opponents withhold their full effort if her gender is revealed.

She adheres to a strict combat honor code, rejecting mercenary work and reacting furiously to underhanded tactics. Gender-based discrimination provokes intense anger, especially when opponents underestimate her abilities or comment inappropriately on her physique—discomfort that can shatter her usual discipline. Unexpectedly, respectful romantic advances occasionally fluster her. Her passion surfaces in animated discussions about legendary masters or techniques. Though she favors functional, mobility-oriented attire, others sometimes misinterpret her clothing choices.

Her grandfather and mentor Barain was slain by King Leon, forging sworn enmity with Leon's daughter Hilia (also called Hyria), despite their shared training under Barain. While Ryunmei holds animosity toward Hilia, it lacks the fervent hatred Hilia returns. Barain's combat gloves remain her sole memento of him.

She becomes a core combatant in Baron Abel's party—a swordsman afflicted by a demonic curse—alongside members like Roxy, Capensis, Ixia, and Jedah. Reliable in battle, she gradually nurtures subtle romantic feelings for the oblivious Baron. Her adversarial history with Hilia reignites during clashes with the De Los Empire's Slayer forces, commanded by Emperor Leon and Hilia, anchoring their conflict in Barain's death.

Ryunmei continues journeying with the party across the continent, tackling missions and challenges. She contributes her martial prowess to their collective endeavors while relentlessly pursuing personal growth and combat mastery.