Those souls who are wandering in the ancient castle with no rest, can you hear the tragic song sung by a human being for you?
Taylor, a middle school student, came to the bookstore during summer vacation and accidentally saw an untitled book with a mysterious ticket to the castle inside. She thought it was a farce, but unexpectedly, the ghost's dream, the mysterious disappearance of the uncle who adopted her, and the deal with the Death Travel Agency made her fall into layers of confusion, and finally set foot on the road to the old castle. What kind of story will happen in the old castle? Is the legendary war that happened thousands of years ago true?