The medieval Shenzhou, Japan, was divided and ruled by various countries. In the sky above it, the city ship Musashi, composed of eight ships, sailed in the distant future. After the re-play of the unified conflict, the countries carried out the holy codex that connected the fate of mankind as the reproduction of the original history. Then, there were various people who hid their confusion and determination in their hearts and moved forward to open up the future. With the overlapping medieval world as the stage, the struggle between the students of the school countries officially took place!