Chiyo Asou is a central character in the manga series 'Ane Naru Mono' (The Elder Sister-like One). She is a demon, known as a succubus, who forms a contract with the protagonist, Yuu. Chiyo is depicted as a caring and protective figure, often taking on the role of an older sister to Yuu. Her character is mysterious yet nurturing, providing comfort and support to Yuu while also having her own depth and secrets. Throughout the series, she balances her demonic nature with her genuine affection for Yuu, creating a compelling dynamic.