One day, Alissa, the royal librarian, finds an abandoned diary. Not realizing it's under a unique magic spell, she takes it home, where she discovers that whenever she writes her name in it, she's transported to an unfamiliar place, where she meets with a boy called Louis. Thinking it to just be the world inside a book, Alissa befriends the young Louis and spends a lot of time with him.

Meanwhile, after years of making his people worry by staying single, a young king invites all the unmarried noble ladies to a ball where he will finally choose his queen. Alissa attends the ball with a light heart, confident that nothing will happen to her, until, strangely enough, the young king takes an interest in her...