Island Beyond the Horizon

Island Beyond the Horizon is a fantasy novel written by Yoko Akiyama, the third in the Horizon series. It has been adapted into a feature film and an anime series, and has received numerous awards.

Described as a "fantasy techno-thriller", the series is set in a an alternate Ordis where magic exists in a 'secret world' beneath modern society. The book once again follows the exploits of Hakugyokurou, the secret Yamataian government agency responsible for magical affairs. Following a chain of events stretching back to the Endwar, the Yamataian and Chiseian governments compete to recover a series of artefacts to discover the location of the "Island Beyond the Horizon", home to the fountain of youth.

Plot
Opening with a prologue set in Wanshu during the Endwar, a shapeshifting Shirakawan agent steals a mystical map from a Yamatai Imperial Army general.

In 2018, a train is transporting the map within Shirakawa, hidden from public perception by powerful magic.