Chiyo Takano, known simply as Chiyo, is a central character in the manga series 'Ane Naru Mono.' She is a mysterious and alluring demon, or yokai, who enters the life of a lonely boy named Yuu. Chiyo offers to become Yuu's sister, providing him companionship and warmth in exchange for something in return. Her role is pivotal as she stands as a guardian and confidante to Yuu, while also grappling with her own enigmatic past and identity. Chiyo's presence brings both comfort and intrigue to Yuu's life.