This young man who is the son of an emperor in Scotland lives a wealthy life, is highly trained with weapons in self-defence, and is blood line to succeed his father as emperor.  But one day, there is a major invasion of monsters from both futuristic and past dimensions.

This boy must go out into the wilderness to defeat the monsters and their master creators, as well as collecting treasures from various dungeons to protect himself with.  Because the monsters come from the past and the future, he must also travel through time and back to defeat the monsters and their creators in their relevant time zones.