Ten years ago, a massive earthquake devastated Tokyo. The city has been rebuilt and life has largely returned to normal—but behind the restored skyline lies a hidden truth. The earthquake was not a natural disaster. It was caused by the emergence of Xanadu: a lethal shadow world whose existence has been kept secret ever since. Now students in the rebuilt city are uncovering its connection to the disaster, and action must be taken to stop Xanadu's forces from threatening Tokyo again.