Hakubō no Dendōshi

Alicia, a half-elf girl, was despised because of her mixed heritage. Irwin, the heir of Count Melanade, made a plot against her. The mysterious traveler Rasail saw Alicia's despair and encouraged her wish for vengeance. They conspired with the elves of Kodama-dani, Alicia's homeland, and proposed a revenge plot against the humans. Rasail's pale face sparkled in a bewitching manner, hiding the "chaos" that lies within!

(Source: Seikaisha, translated)