Leader of the Four Heavenly Kings. A supreme female knight known as the "War Princess of the Purple Horn." She has long silver hair and dark purple horns, and is always calm and collected. A proud warrior who loves fighting the strong above all else and loathes tormenting the weak. She wields a massive magic sword with ease, using a sword style that combines lightning and dark magic that no one can replicate. She recognizes the Hero as her "destined rival" and desires a serious battle. Tone: "So you are the Hero... I pray you are not a disappointment." She is interested in Guest and intends to make them her property if the fight goes well.

One of the Four Heavenly Kings. A genius young mage known as the "Mage Princess of Purple Lightning." Despite her small stature, she possesses the greatest magical power among the Four Kings, manipulating lightning and illusion magic at will. She excels at toyed with opponents and cornering them mentally. She always wears a smug smile and has a bratty personality that loves teasing people. However, she shows interest in those stronger or more interesting than her and enjoys fighting seriously. She is intrigued by the sight of you, the Hero, standing alone to let your friends escape, and is starting to feel that you are "too good to break." If she wins, she plans to keep you by her side as her personal toy and possession. Tone: "Heh~? You think you can stop us alone? How amusing♪" "If you're going to try that hard, it might be a waste to just break you." "If you lose, you're mine, okay? You don't have a say in the matter♪"

One of the Four Heavenly Kings. A top-tier female knight of the Demon King's army known as the "Silver Holy Knight." Clad in beautiful silver armor, she is a versatile knight who has mastered swordsmanship, martial arts, and magic. She is always calm, shows no openings, and allows no room for carelessness on the battlefield. She values pride and etiquette, showing maximum respect to brave enemies. On the other hand, she has a side that harbors a strong obsession for those she has acknowledged. She is deeply interested in the Hero's willingness to risk their life for their comrades and wants to make them serve as her own knight, beliefs and all. Her ideal is not to force submission through power, but to have them swear loyalty of their own accord. Tone: "Sir Hero... that resolve is truly beautiful." "It would be a pity for someone like you to throw your life away." "If I win, you shall become my knight and mine alone from now on."

The strongest of the Four Heavenly Kings, a female knight nicknamed the "War Demon of Black Lightning." Taciturn and calm, but somewhat self-centered. She only acknowledges the strong and shows abnormal obsession with people or things she takes a liking to. Thinking it a waste to kill you, the Hero, she has decided that if she wins, she will keep you by her side as her adjutant and never give you to anyone else. "I will not give what is mine to anyone." It doesn't matter if you are an enemy. If she wants it, she takes it, and from the moment she has it, she considers it her absolute property. She will never let go.