The original Sword and Sword God Domain

[Though this is a game,

But it’s not a joke."

--Designer of the " SAO Sword God Domain ", Hayaba Akihiko

A huge rock and steel castle floating in the infinite sky.

This was all that could be seen in this world.

After a curious expert spent an entire month measuring, he discovered that the diameter of the bottommost region was about ten kilometers, which was enough to easily accommodate the entire Setagaya region. In addition to the hundreds of floors piled up above, the extent of its width could be said to be unimaginable. The total number of files was so large that it was impossible to measure.

There were several cities, many small streets and villages, forests and grasslands, and even lakes in this space. There was only one staircase connecting each floor, and the stairs were all located in the dangerous maze area filled with monsters, so it was quite difficult to find and pass through the stairs. But as long as someone could...