Definitely! High School DxD has a manga. It brings the world and adventures of the series to life in a different medium, giving fans another way to engage with the content.
In a Naruto and High School DxD fanfiction, there could be a scenario where the protagonists of both stories meet in a neutral dimension. Issei from High School DxD might be intrigued by Naruto's ninja skills and determination. Naruto, in turn, could be curious about Issei's Sacred Gear. They could start training together, sharing their knowledge and skills, and ultimately have to face a common enemy that threatens both their worlds.
Some anime - related websites might also offer the novel for reading. However, make sure it is legal in your area. You can also ask in some anime or light novel fan communities for reliable sources to read the 'High School DxD' novel.
Another place is Archive of Our Own (AO3). It's known for its wide range of fan - made content. There are many 'High School DxD' fanfictions there with different themes and ratings. You can also filter the search results based on your preferences, such as by character or genre.
Asta could be brought into the High School DxD fanfic as a result of a multiverse - related event. In this case, different universes are colliding or being connected in some way. His presence would disrupt the power balance as his anti - magic is something that no one in the High School DxD world has really encountered before. He could end up training with the devils to learn more about their magic while also teaching them about the concept of anti - magic.