Devils are embodiments of concepts. The chainsaw devil has a special ability where if it eats another devil the concept is erased. This is revealed towards the end of the series, and one of the devils eaten was the nazi devil. Also ate things such as AIDS and nuclear weapons. How it works exactly is unclear, but after a concept has been erased it stops existing and all memory of it also disappears.
and WW2 in general probably. the manga takes place in the late 90's but the USSR still exists, probably a result of the nazis as well as nukes being erased from reality
It is a lot less suspicious than it sounds
spoilers for the manga
Devils are embodiments of concepts. The chainsaw devil has a special ability where if it eats another devil the concept is erased. This is revealed towards the end of the series, and one of the devils eaten was the nazi devil. Also ate things such as AIDS and nuclear weapons. How it works exactly is unclear, but after a concept has been erased it stops existing and all memory of it also disappears.
spoiler
So he undid the Holocaust?
spoiler
and WW2 in general probably. the manga takes place in the late 90's but the USSR still exists, probably a result of the nazis as well as nukes being erased from reality
spoiler
Wait this is all background? So the protagonist doesn’t actively cancel the holocaust in the series? It’s just part of the alt-reality?
All that happened before Denji becomes chainsawman, yes. It doesn't really have much impact on the plot until the reveal.