妖しのセレス

On her 16th birthday, Aya Mikage and her twin brother Aki are summoned to the Mikage family estate, where Aya’s touch of a mummified hand awakens her as the reincarnation of the celestial maiden Ceres, unleashing supernatural powers. The family, fearing Ceres’ wrath for stealing her celestial robe, attempts to kill Aya, while Aki collapses, bleeding, revealing his own connection to Ceres’ past husband, Mikagi. Aya escapes with help from Yuuhi Aogiri, finding refuge with his sister Suzumi, who reveals Aya’s celestial heritage. As Ceres intermittently takes over Aya’s body, seeking to destroy the Mikage family and reclaim her robe, Aya struggles to retain her identity. Mysterious ally Toya, employed by the Mikages, emerges, complicating Aya’s mission to save Aki and uncover the truth behind the family’s sinister “C Project.” (Unreviewed summary by Grok 3)