The story would also change the perception of Naruto. Instead of being seen as the hero of Konoha, he would be considered a traitor by many. This would create a whole new set of relationships and conflicts. His friends might try to convince him to change his mind, leading to some very emotional and complex storylines. The shinobi world as a whole might start to question the values that Naruto has always represented, like loyalty and perseverance. And if Konoha does fall, it could inspire other villages to reevaluate their own security measures and relationships with their ninjas.
One possible reason could be that Naruto feels betrayed by Konoha. Maybe he discovers some dark secrets about the village's leadership or past actions that make him question whether Konoha is truly worth saving. For example, if he finds out that they were involved in unethical experiments or unjust treatment of certain clans. Another reason might be that he has been pushed too far by the villagers' continuous mistrust and discrimination towards him, despite all he has done for them. So he decides he's had enough and refuses to save the village that has not fully accepted him.
Maybe he has some personal grudges against the village. For example, he might have felt betrayed by the village in the past and that made him reluctant to offer help.
One reason could be that she feels betrayed by Konoha. Maybe she has faced discrimination or unfair treatment there in the past because she's female in a world that might be more used to male ninjas. For example, she could have been passed over for important missions or training opportunities just because of her gender.
Perhaps Naruto has been pushed too far by the villagers' continuous mistreatment. Even though he has saved them multiple times, they still show hostility or indifference towards him. So, in the fanfiction, he decides not to help Konoha anymore as a form of self - protection and to break free from this one - sided relationship.
The story could progress with Konoha facing a great threat without Naruto's help. The village might initially struggle to find a replacement for Naruto's power. This could lead to a sense of panic among the villagers and the leadership. Some might start to regret their past actions towards Naruto.
One possible reason could be that Naruto feels betrayed by Konoha. Maybe he discovers some dark secrets about the village that make him question whether it's worth protecting. For example, if he finds out that the village elders were involved in unethical experiments or unjust actions against certain groups. Another reason might be that Naruto has different ideals now. He could believe that there are more important things in the world than just protecting Konoha, like bringing true peace to all nations without focusing on one village's interests.
Perhaps Naruto has found a new purpose or community outside of Konoha that values him more. He may be so content with his new life that he simply doesn't want to get involved with Konoha's problems anymore. Konoha's actions towards him could have made him realize that his loyalty was misplaced all along.
The overall Naruto universe would be turned upside down. Naruto's refusal to protect Konoha could lead to a breakdown in the relationships he has built. His former allies in Konoha might become his enemies, and those who were once his enemies outside of Konoha might try to use him for their own gain. The Akatsuki, for example, might try to recruit him or manipulate him to further their goals. This would create a whole new set of conflicts and alliances that we haven't seen in the original story.