In one world line, up through the Showa era, there was someone who had the memory and pointed out that only Emperor Jinmu bore the title “Tennō” (Emperor), and that apart from Jinmu the others were not Tennō.
In one world line, someone remembered, and pointed out, that up through the Showa era only Emperor Jinmu’s title was Tenno (emperor), and that except for Jinmu, they were not Tenno. Would their titles have been something like jinno (human sovereign), kotei (emperor), or XX-ō (king)?
This case is part of the Mandela Effect case database based on "The Window of Opportunity: A Guidepost to the Mandela Effect — The Ultra-Secret X-Files" by Aoyama Takuto.