The beginning of the 20th century of the 19th century. It follows the rule of islands, Age when territory expansion is done all over the world. Ivan great empire in which armaments are enhanced most i-kuni Home country Mizuho imperial country. However, combat is begun. The imperial country is a period of on the way to, Still for the country of a small household, Event at arrowhead to which war potential securing as self-defense is hurried.

Result, In the first battle, The Mizuho fleet is defeated. The army is isolated in the jun fortress. The corps of i kuni army began landing to the imperial country mainland.

Having saved the Mizuho imperial country that became a light before the wind in the homeland defense line regarding, saying that six the military clique 6 hibike that takes root from of old in the imperial country as a samurai, Similarly the existence of Walking armor exploited in the imperial country.

The story starts in the Mizuho imperial country at three years laters.