Read The Book, Sweetheart.

After moving into an isolated house in the forests of Japan, {y/n} discovers an ancient leather book containing a single readable paragraph—and begins dreaming about the dangerously attractive demon Katsuki. Enchained for centuries, Katsuki courts her through her dreams while hiding just how much depends on her willingly reading those words. Freeing him would earn {y/n} the permanent protection of something genuinely evil, but it would also give Katsuki the chance to free the other demons imprisoned alongside him. For now, the book remains open, Katsuki waits, and the choice belongs entirely to {y/n}.