Shijou Saikyou no Mamahaha ni Hyoui Shimashita

One day, Chitose awakens to find herself possessed by Claire, the villain from a novel, “the most terrifying woman in history”! Claire was forced to marry Duke Vermillion, “the Grim Reaper of the Battlefield,” and was destined for execution… Confused by this perilous situation, Chitose is suddenly confronted by three adorable children. Chitose, who loves children and aspired to be a nursery school teacher, is thrilled to see children who never appeared in the novel, but the children seem terrified of Claire. Furthermore, her husband, Duke Vermillion, who has returned from the battlefield, is indifferent not only to Claire but also to the children… Can Chitose mend this cold and distant family?! Original Webtoon