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After the war, the surface of the earth was desolate under nuclear radiation. It took several generations for the surviving humans to finally adapt to underground life. In a new society that has solved the problem of survival, the entertainment industry has been reborn, but what people don't know is that new dangers have also followed...

The magical alien continent is full of dangers. Otaku Liu Yu comes "strongly" with his loose system. Alien? It's trivial. Undead? Not enough. Demon King? I'm fighting the big devil!