Senrihin Reijou Sheryl wa Jibun Okorosu Otto wo Kago Shita

The king's niece, Sheryl, possesses the "Ark of Knowledge"—the ability to record every word she reads into a vast, otherworldly library. One day, hidden within its shelves, she discovers a “biography” she has no memory of ever reading: her own. And within its pages lies a chilling revelation—her future as the bride of Luke, a cruel and ruthless marquis from an enemy nation, and her eventual murder at his hands! Her only path to survival? Make her future husband fall head over heels for her! Thus begins Sheryl's fruitless effort to ensnare Luke's heart. Yet her earnest, unwavering innocence begins to unconsciously stir something within Luke… Source: MU