The plot might involve a curse. Naruto could be cursed by an ancient power. As a result, his friends' memories of him start to fade away. He might notice this when they stop responding to him as they used to. Naruto would be heartbroken but determined. He could search for the origin of the curse, facing many challenges along the way. And in the process, he might discover some long - lost secrets about his own family or the ninja world that are related to this curse.
It could be a rogue ninja who has a grudge against Naruto. This ninja might have developed a special jutsu that can manipulate memories. He uses it on Naruto's friends to make them forget Naruto, hoping to isolate and break Naruto's spirit.
He would likely feel extreme loneliness. Naruto has always valued his friends, so being forgotten by them would be like losing a part of himself. He might start to doubt his self - worth, thinking that if his friends could forget him so easily, then maybe he wasn't as important as he thought.
One possibility is that Naruto might have made a great sacrifice that his friends didn't fully understand at first. Maybe he had to go on a dangerous mission alone and was presumed dead. His friends, in their grief and shock, gradually started to forget about him as they moved on with their lives. For example, they could have been so focused on protecting the village from new threats that they didn't have time to dwell on Naruto's absence.
One possible plotline could be Harry feeling extremely isolated and trying to find new friends outside of his usual circle. Maybe he starts to focus more on his studies and discovers new magical abilities on his own.
One possible reason could be that Naruto is afraid of endangering his friends. He has many powerful enemies, and he might think that by staying away from his friends, they won't be targeted. For example, Orochimaru was always after Sasuke, and Naruto might fear that his closeness to Sasuke could put Sasuke in more danger.
One possible plot could be that Naruto's family, perhaps due to some dark magic or a curse, completely forgets who he is. Naruto then has to struggle not only with his normal challenges in the ninja world but also with the heartbreak of being forgotten by his own family. He might try to find a way to reverse the situation while also facing enemies who take advantage of his family's memory loss.
Perhaps in this fanfiction, Naruto starts to have dreams about his parents where they seem distant and unrecognizable. This makes him search for answers, leading him on a journey where he uncovers secrets about his family that were long buried. As he digs deeper, he realizes that there were forces at work that made it seem like his parents forgot him, when in reality, it was a much more complex situation.
Naruto may try to find out the reason why he is forgotten. He will start by reflecting on his own actions. Maybe he thinks he has done something wrong that made his family forget him. Then he will strive to correct it. At the same time, he might also seek help from his friends like Sasuke and Sakura, who always stand by him.
Typically, Naruto is known for his deep love and loyalty towards his friends. Fanfiction that has Naruto hating his friends is probably a deviation from the traditional understanding of the character. It might be used to explore some extreme scenarios, like if he was under some sort of mind control or if there was a huge misunderstanding. But in the mainstream Naruto - themed fanfiction, this is not a common occurrence.