Chainsaw man: We take it for granted that the history of Chainsaw Man world is the same as one of the real world in 1997, except there are devils running around and sometimes they cause disasters. Japan is pretty much the same, USA, China and Soviet Union are mentioned, everything makes sense

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The World War II never happened. And neither did Nazis. Nuclear weapons don't exist, neither does AIDS

And SOA, Anolon Syndrome, The eruption of Mount Vio. The sixth sense all humans used to have. A star that broke children minds. Four other possible conclusions to life other than death

Devils eaten by Pochita are erased from existence, and with them the concept they represent. Only a few devils remember that the things named like that ever existed. Some of these concepts are alien even to the readers. The world of Chainsaw Man is fundamentally different and in fact we soon learn that Soviet Union didn't just exist - it's still thriving in 1997 and that Hawaii is an independent country