After a mysterious attack wipes out the major cities of 19th century Japan, Korea, and China, survivors from all three lands find refuge on a hidden island and build a new society. Hana, the orphaned daughter of Korean peasants, and Kenichi, son of a great samurai leader, have little in common except for a mutual disdain for the other.
The war for the Island rages on—but in the heat of battle, will neither side open their eyes to the true threat bearing down on them, in the form of the Byōnin?