Maybe Naruto and Kurama are somehow summoned into the Highschool DxD world. Naruto has to adapt quickly to the new rules and powers. He could form an alliance with some of the main characters in DxD. Kurama's power could be seen as a demonic power by some in this new world, leading to misunderstandings and conflicts that Naruto has to resolve while also trying to find a way back to his own world.
One way could be that Naruto's skills and values from his own world clash and then blend with the supernatural elements in Highschool DxD. For example, his strong sense of justice might lead him to oppose some of the more chaotic or immoral actions in the DxD world. And his ninja techniques could be a new and interesting addition, like using shadow clones in battles against devils or fallen angels. Kurama could also play a role, perhaps his chakra influencing the power dynamics in the DxD setting.
The story could develop with Naruto being a transfer student in the Highschool DxD universe. He might initially be an outcast because of his different abilities and background. But as he shows his strength and loyalty, he gains friends. Kurama's presence could be a secret power that he gradually reveals, which could make him a target for some factions who want to harness Kurama's power for their own ends.
If you want the clearest chapter reference, go to Chapter 83. Early on, When they received the task, the three of them were already sharpening...; later, the chapter leans on He Yun had originally wanted to try making braised fish under Jiang Li's....
Look to Chapter 81 for the clearest answer. It begins with Qi Tianyu, who chose curry beef rice, received a piece of curry and a..., keeps building through Shu Yan was relatively lucky, she got a bundle of noodles and a bag of..., and lands on The summer on the Southwest Plateau is no joke;
If you want the clearest chapter reference, go to Chapter 80. Early on, Jiang Yan and Wen Jiaojiao, one so smug he was almost ascending to the...; later, the chapter leans on And this was exactly the scene Director Sun wanted to see..
If you want the clearest chapter reference, go to Chapter 134. Early on, After a brief noon rest, the production team was up to their antics again.; later, the chapter leans on Just as several guests had finished their relaxing hot showers and were....
Look to Chapter 105 for the clearest answer. It begins with But this did not elicit any sympathy from the woman on the phone; on the..., keeps building through Do you know why you haven't been getting good roles or making money these..., and lands on However, the next second, things took a turn..
A practical answer is Chapter 99, because it turns the idea into a concrete scene. The chapter opens with Seeing the man approach, one of the individuals with a long scar across..., adds pressure through And so, a ludicrous and chaotic scene unfolded— A tall man wearing..., and ends on Just as she.
Look to Chapter 99 for the clearest answer. It begins with Seeing the man approach, one of the individuals with a long scar across..., keeps building through How is it, have those people outside left?" "They're gone." The man spat..., and lands on Just as she was considering whether to practice a.
If you want the clearest chapter reference, go to Chapter 130. Early on, This task, the first one, should have been his in the bag.; later, the chapter leans on However, just as he was about to get out of the water and take a short....
The best chapter pointer here is Chapter 92, "Why would a 19-year-old girl read this kind of book?!". It opens with Jiang Li, lightened from any task, had plucked a few leaves from the... and closes on Finally, someone entrenched in the circle couldn't hold back and sent a....
The best chapter pointer here is Chapter 127, "He's Not Snobbish, Just Simply Bad-Tempered". It opens with Witnessing Jiang Li leave with a bucket, Jiang Yan refused to admit... and closes on He Yun, who chose the codonopsis, became the one with the most challenging....