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.
Under threat from a mutated horde, the island is forced the cede control to General Sato—and Hana and Kenichi have a choice to make. Torn between protecting their home or standing against a threat to all of humanity, the two warriors find that their differences may divide them yet again.