 If you liked
Adolf ni Tsugu
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 ...then you might like
Tokeijikake no Ringo
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As Tokeijikake no Ringo is an anthology, this recommendation is just for the The Execution Ended At Three chapter.
Both are manga set during World War II that show the discrimination towards jewish people while also introducint a hypothetical historically not accurate element as a central plot element. Both are made by the same author.