The village of Konoha would be in shock. Naruto is seen as a hero, but killing Sasuke, who was also a powerful and well - known ninja, would be a very controversial act. Some might support Naruto, believing he had no other choice for the greater good. Others would be angry and might even turn against him, thinking he could have found another way.
One common theme is heroism. Many fanfictions focus on the brave actions of soldiers or civilians during the war. Another is the theme of survival. Characters are often depicted trying to survive in the harsh conditions of war - torn areas. And then there's the theme of love in the midst of war. It could be the love between soldiers and their families back home, or a romantic relationship that develops between two people in the chaos of war.
The Allied forces worked hard to document the war crimes. They collected evidence from all over Europe. This evidence was used in the trials to prove the atrocities committed by the Nazis. Countries around the world also became more committed to preventing such genocides in the future.
In such a fanfic, the real world's reaction would vary. Kids would probably be excited and see Naruto and his friends as heroes. However, adults would be more cautious. The media would go crazy, reporting on every move of these new arrivals. There would also be those who would try to profit from the situation, selling Naruto - related merchandise or offering tours to see the 'newcomers'.
Naruto might initially be in shock. He has always believed in his friends, so the betrayal would be a huge blow. He could try to reason with them at first.
At first, the village would be thrown into chaos. People would be speculating all kinds of reasons for his disappearance. His closest friends would be heartbroken and determined to find him. The elders of the village would be concerned about the political implications. Without Naruto, their main source of power and protection seems to be gone. However, some might also see it as an opportunity for a new era in the village, one that is not so reliant on a single individual, but this view would be in the minority at the start.
Sasuke would likely be conflicted. On one hand, he and Naruto have a deep bond, but on the other, Sasuke has his own ideas about justice. He might try to stop Naruto at first, reasoning with him. If that fails, he could be forced to choose a side, either to support Naruto's cause if he believes there's some merit to it, or oppose him to protect the shinobi world as he knows it.
The village of Konoha would be in chaos. Naruto was seen as a hero, and if his dark side kills Sasuke, it would shatter the trust of many. His friends like Sakura would be devastated. She might go on a revenge quest against Dark Naruto. The Uchiha clan, which Sasuke was part of, would also be in turmoil. They might see this as an act of aggression against their clan and seek justice.
Naruto would likely be very curious and excited. He'd probably try to befriend everyone, whether they were humans, demi - humans or monsters. His positive attitude would be a shock to some of the more cynical characters in the Overlord world. Sasuke, on the other hand, would be more guarded. He'd assess the situation and look for ways to gain power. He might see the powerful magic and different races as a means to achieve his own goals.
Yes, the book "The Road to Card Creation from Muye" was set in the Huoying Continent after World War II. I recommend this novel. The plot is interesting and worth reading. I hope you like my recommendation. Muah ~