A Princess of Belfast, and daughter of King Tristwin and Queen Yuel. Yumina met Touya when he heals her father from an attempted poisoning. Yumina possess the Null magic "Mystic Eyes", an ability that comes from her Heterochromic Eyes which give her the ability to see a person's true nature. Due to this power, upon seeing the selfless and kind aura surrounding Touya after he saves her father, she asks to be engaged to him, believing that she will never find a better candidate to be her husband. She is also proficient with bows and arrows, often choosing to fight alongside a pack of hunting wolves summoned with her darkness attribute.