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What can you do if you gain the ability to travel back and forth between reality and fantasy worlds? The two worlds are ruined? No! The materials of the earth will change into the fantasy world. Electronic products and machinery cannot be used. Dominate the world? Don't want! What is there to dominate in a fantasy world that is still in the seventh or eighth century? Is the air conditioner uncomfortable, or are the movies and novels not good to watch? Three thousand beauties in the harem? Serfs and slaves living a precarious life, "skinny beauties" with yellow skin and skinny skin? Doesn't the lady in black stockings on the phone look good? So what are you doing traveling through a fantasy world? Of course it's the extraordinary power of a fantasy world! This is the career of a time-traveling lord who just wants to learn extraordinary power.