In Yggdrasil, there were Four players that reached such a high level, they were called by the community the Four Horsemen. But when the new world came, YSS Drive, the strongest horseman was dragged into it and the other horsemen were dragged as NPCs. What can the strongest player in the world will do if he get's stuck in the game.

The semi-novas are a new kind of soldiers against the novas, however they were prohibited by the ere are only two of them Harry and Luca, they are going to hide in west genetics, but for this they have to be normal students. A new kind of danger is going to attack west genetics, are there really only two semi-novas alive.