The day when chaos and destruction of unknown causes engulfed all time and space at once. The world we know and the world we didn't know are all destroyed. But at the last minute of its demise, 13 great men, now called the Academy Principal, pulled together the last fragments of the tens of thousands of pieces of the world to create a single world.

There was only one survivor per each world's debris who represented their own world and species. It was a beautiful ruin where men of seven species, who had only heard of as legends, could destroy the world with just one gesture. The place where they came together to rebuild the world and started classes for the new world is called Private 666 Ark Academy.

Where they gathered to learn the new world's order by wearing constrained clothes to seal their own power. But why did I become their professor on behalf of human beings... ?!!!