It could be that the whole Team 7 is brainwashed by an evil ninja with powerful genjutsu abilities. They are made to believe that Naruto is the key to a great evil that will destroy the ninja world. As a result, they turn on Naruto, and he has to fight not only his former teammates but also the false accusations and the real threat behind the brainwashing.
One possible plot could be that Konoha's leaders, fearing Naruto's growing power, secretly plan to get rid of him. They spread false rumors about him, turning some of the villagers against him. Another plot might be that they frame Naruto for a crime he didn't commit, perhaps a major attack on the village, in order to justify exiling or imprisoning him. A third possibility is that they withhold important information from Naruto that could put his life in danger, all in the name of protecting the village's secrets.
One possible plot could be that Naruto discovers his friends have been secretly working with an enemy. They might have been promised power or something valuable in return for betraying Naruto. Maybe they spread false rumors about Naruto, turning the village against him.
One possible reason could be a misunderstanding. Maybe there was some false information spread about Naruto that made Team 7 believe he had done something unforgivable. For example, if an enemy framed Naruto for attacking the village secretly, and Team 7 fell for it without proper investigation.
One possible plot could be that Naruto's family, perhaps his father or mother, were actually alive but had to fake their deaths for some dark reason. Then they reappear and turn against Naruto, maybe because they are being controlled by an evil force. Another plot might be that his family had some long - hidden secrets that made them see Naruto as a threat to their real goals, so they betrayed him.
One possible plot could be that Amy Rose discovers her closest friend has been secretly working against her goals. For example, if she's on a mission to save Sonic, and she finds out that someone she trusted has been trying to undermine her efforts all along. This could lead to her feeling betrayed and having to re - evaluate all her relationships.
Well, in a 'mikan sakura betrayed fanfic', she could be betrayed by her family. Say her sister steals an important opportunity from her, like a chance to study abroad or participate in a big competition. It would be a huge betrayal as family is supposed to support each other. Also, in a magical or fantasy version, Mikan could be betrayed by her mentor in the art of magic. The mentor might use Mikan's trust to steal a powerful magical artifact that Mikan was supposed to protect.
One possible plot could be that the Pokemon Team Hypno is on a quest to find a legendary Pokemon. Hypno's psychic powers are used to sense the location of this rare Pokemon. They face many obstacles like other rival teams who also want to find the legendary Pokemon first.
After the initial shock, Naruto could become determined to prove his innocence if that was the case. He's a fighter, and he wouldn't just let this false accusation or betrayal stand. He might set out on a journey to find the truth and clear his name, all while struggling with the pain of his friends' actions.
Danzo could also be the main antagonist. He is known for his underhanded methods and distrust of anyone with too much power. Since Naruto has the power of the Nine - Tails, Danzo might spread lies within Team 7 to make them think Naruto is a danger, causing them to betray him.
Perhaps the aura guardian was mind - controlled. An evil force took over its mind and made it act against Ash. In this case, the story could revolve around Ash trying to break the mind - control and save his friend. It would involve a lot of action and mystery as Ash figures out what's wrong and how to fix it.