When eight-year-old Ai Li appeared out of thin air calling "Mom and Dad", she brought a pocket watch that could tear apart time.
The dusty pages of "Bingguo" in the Ancient Book Society freeze the silent cry from 33 years ago;
The confession that never came out of Oreki Houtarou's heart has been stuck for too long.
——The key to saving the past and the future is actually in the hands of this daughter from the future.
