Onihime

Raised as the cherished daughter of the Oni clan's supreme ruler, Onihime grew up immersed in the power and pride of her people, developing an unyielding competitive spirit and a burning curiosity about the world beyond her realm. She repeatedly stands in the way of protagonist Momoko as her destined rival, their clashes driving much of the story's tension. As the narrative unfolds, a stunning revelation comes to light—Onihime is none other than Momoko's long-lost twin sister, separated since birth. Bound by both rivalry and blood, she emerges as the most pivotal character in the entire story.