Naruto might initially feel disbelief. He's used to seeing the good in people, so Akeno's betrayal would be a huge shock. He could go into a state of self - doubt, wondering if he misjudged her all along.
He would probably be angry. Naruto has a strong sense of justice and loyalty, and Akeno's betrayal would be seen as a violation of those values. He might start to look for ways to get revenge or at least make her understand the wrong she's done.
Naruto could initially be shocked and hurt. Given his trusting nature, Akeno's betrayal would come as a big blow. He might go into a state of disbelief, trying to figure out why she would do such a thing.
Naruto might be angry at first. He is not one to take betrayal lightly.
Naruto's reaction could be a mix of sadness and resolve. He has a big heart, so the betrayal would cut deep. But he also has the will of fire within him. He could use this as fuel to rise above the situation. He might seek out new allies in the High School DxD world, like Issei and his friends (if they weren't part of the betrayal). Together, they could work towards uncovering the truth behind the betrayal and taking on any threats that might be related to it.
In this fanfiction scenario, Naruto's betrayal by Akeno could be due to a misunderstanding of their goals. Maybe Akeno has been influenced by some dark forces that made her turn against Naruto. It could also be that there is some hidden information that led to this sudden change in their relationship.
In fanfiction, Naruto being betrayed by Akeno could be a very interesting plot twist. It might start with Akeno having some hidden motives or being forced by an external power to turn against Naruto. Maybe she was blackmailed into doing so. This could lead to a whole new set of adventures for Naruto as he tries to figure out why she betrayed him and also deal with the consequences of her actions.
One possibility is that Naruto becomes more isolated. After being betrayed by Akeno, he might find it hard to trust others. He could go off on his own to train harder and become stronger, vowing to never let such a betrayal happen again. This could lead to him unlocking new powers or abilities as he focuses solely on self - improvement.
He would be heartbroken. Naruto has a big heart and has always trusted his friends. This betrayal would be a huge shock to him.
Naruto would be deeply hurt. He has grown up with so little love and acceptance in the village, and Hiruzen was one of the few people he thought cared for him. His reaction could involve a lot of self - reflection. He might question his own worth and what he has done wrong. But ultimately, his positive nature would take over. He would try to understand Hiruzen's reasons, even if he didn't agree with them. And he would strive to find a way to reconcile and make Hiruzen see that he is not a threat.
At first, Naruto might try to reason with the Western side. He would want to understand why they betrayed him. He believes in the good in people, so he would hope that there was some misunderstanding. However, if they continued to be hostile, Naruto would become determined. He would gather his own allies, like his friends from Konoha, and form a resistance against the Western forces. He would use his powerful jutsus and his unwavering spirit to take on those who wronged him.
One possible scenario could be in a political intrigue within their respective villages or organizations. For example, if there are power - hungry individuals who see Naruto and Akeno as threats to their rise to power. They might spread false rumors about them, making their friends and allies turn against them. This would be a form of betrayal as those they trust would be misled into believing the lies.