Since I don't have direct knowledge of 'kuitsume youhei no gensou kitan light novel', it's difficult to say precisely. But often light novels in the fantasy genre involve elements like magic, a journey, and character development. Maybe this one is about a young warrior in a strange and magical land, facing various challenges and making friends or enemies along the way.
Since it seems to be a Japanese - related novel (judging from the title), it might have themes related to Japanese cultural values such as honor, loyalty, and the connection to the spiritual or supernatural world. It could also explore themes of a hero's journey, where the protagonist faces challenges and grows throughout the story.
I'm not very familiar with this specific novel. But you could try looking for novels in the same genre. For example, if it's a fantasy novel, you might like 'The Lord of the Rings'. It has a richly built fantasy world with various races and an epic story of good against evil.
One possible reason could be that Naruto feels betrayed by Konoha. Maybe he discovers some dark secrets about the village that make him lose faith in it. For example, if he finds out that the village elders were involved in unethical experiments or plots against his friends or family, he might not want to help.
Konoha would initially be in shock. Naruto is a hero to many in the village, and his sudden departure with Itachi, who was once considered a traitor, would cause a lot of unrest. The villagers might start to question the leadership of the village, wondering why Naruto left and if there was something they could have done to prevent it.
Well, in some fanfictions, Naruto might outsmart Konoha by using his unique knowledge of the village's secrets that others don't know. For example, he could use his understanding of the old tunnels under Konoha to his advantage in a situation where he needs to escape or gain an upper hand in a conflict.
Ruby's speed and scythe - wielding skills could be very useful in Konoha. Her semblance of super speed would make her a formidable opponent in combat. She could quickly dodge ninja attacks and surprise her enemies. Her scythe could be seen as a unique and powerful weapon in the ninja world. Weiss's glyphs and ice magic would also be a great asset. She could use her ice to create barriers or freeze enemies in place, which is similar to some water - style jutsu. Her summoning of the Arma Gigas could be a new and powerful addition to the battles in Konoha.
They could bring new ideas. For example, if they come from a different place, their cultural ideas might influence Konoha's fashion or food. Their presence might also inspire the local kids to work harder in their ninja training, seeing two new and exciting role models.
It would be a huge blow to Konoha. Naruto is a hero in the village, and his departure would leave a big leadership void. The villagers would also lose a great source of inspiration. Hinata is from a respected clan, and her leaving would also have an impact on the clan's standing in the village. Morale among the ninjas might drop as they see two important figures leave.