Magnus Against Apocalypse

Currently working on the rework version of this series ... After his party defeats the demon lord, Magnus, the greatest mage of humans, is forced to transfer himself to the hero's original world. For he has to save it from the demon king's final curse. But an error occurred, which cost him the only magic stone he brought. It makes him unable to cast magic. Realizing that the world has been filled with undead, and pants are the only thing he wears now. As he stands on a rock that is also accidentally transferred with him to that world, he screams... "HEEEEEEEEEEELP MEEEEEEE !!"