Light Novel Still Does Demian Have Only One Brain? / Hiroshi Mori Kodansha Taiga

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A long, blonde, blue-eyed man who calls himself Demian, carrying an old Japanese katana, visited グアト as a German musical instrument craftsman. He said he was looking for a robot called "Roydy" in グアト. He was a special walker Ron developed for military use, escaped destruction when the project collapsed, and was pursued by the German Intelligence Agency. What does the intelligent weapon Demian want?