Kanojo ga Koushaku-tei ni Itta Riyuu

Rinko Hanasaki dies unexpectedly and awakens inside a novel she once read, now living as Raeliana McMillan. She knows exactly what happens to this minor character: Raeliana is destined to be murdered by her fiancé, Francis Brooks. Her first priority is therefore simple: end the engagement before the story reaches that conclusion.

When Francis refuses, she turns to someone far more powerful: Duke Noah Wynknight, the novel’s clever and dangerous male lead. Using what she knows about his secrets, Raeliana proposes a deal that makes him her fake fiancé and protector. But getting close to Noah places her inside events she was never meant to influence, and every successful change makes the future she remembers less reliable.