Aku

One of the heroines of the story. A village girl. Her parents died of illness when she was young, which exacerbated the persecution she faced from the entire village, leading to her being offered as a sacrifice to the demon king Greol, where she was saved by Kunai. Her eyes are different colors, and she hides her left eye with her long bangs. She refers to herself as "Boku." With a pure and innocent personality, she calls Kunai "Demon Lord" and adores him like a father. Due to the persecution, she was limping with her right leg when she first appeared, but it was completely healed by Yū's treatment. Unlike Luna and Tron, as of episode 12 of the anime, she is an ordinary person without any special abilities. Because of this, in the manga version, Yū and other aides like Tahara question why Aku receives Kunai's favor despite not having any abilities to offer in return.