Mark is a former bodyguard. To return the dead relatives, he goes to the zero world, the kingdom of Regnum. In this world, everything is ruled by Heaven, it is fair, and each inhabitant sets his own measure. Here Mark needs to protect the "thirteenth," only everything did not go according to plan: he does not know where to look for him, and even more so how to protect him. After all, he himself turned out to be one of the weakest in the zero world, and his measure is zero. The cycle is over.