"Head Researcher" is an unnamed individual who lived and died centuries prior to the start of the main narrative. He is occasionally referred to by other titles such as "Idiot Inventor," "Stupid Chief Engineer," "The Scientist," or similar epithets. Born in modern-day Japan, he was dispatched to a Fantasy World set in the distant past as a Reincarnator, tasked with battling the Demon King of that era. Although we never encounter him during his lifetime, fragments of his existence are revealed through his research diaries.
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