I'm not entirely sure specifically what 'black rule obeah scool stories' are. 'Obeah' is a form of folk magic in some Caribbean cultures. It could be stories related to some sort of rules within a context that involves black magic or obeah in a school setting, but without more context it's hard to say for sure.
The content of the 13th volume of the novel " Demon High DxD " was as follows:
In the third chapter," The Lost Glory," the protagonist, Armstrong, and his companions came to a mysterious ruin and found the legendary Demon Sword.
This sword has a powerful force that can give the wielder a powerful ability. However, this sword also had a dangerous weakness. Once it was attacked, the wielder's body would fall into a deep sleep and wait for the next awakening.
In order to obtain the Devil's Sword, Armstrong and his companions engaged in a fierce battle. In this battle, not only did they have to face powerful demons, but they also had to face their own fears and uneasiness.
In the end, Armstrong and his companions defeated the Devil's Sword, but they also realized that this battle would not end so easily. They needed to continue fighting until they achieved true victory.
In the fourth chapter," The Power of Darkness," Armstrong and his companions began to explore the depths of the ruins and found a mysterious cave. In this cave, they found a huge demon waiting for them.
In the end, Armstrong and his companions engaged in a fierce battle with the demons. In this battle, not only did they have to face the powerful strength of the demons, but they also had to face their own fears and uneasiness.
Through this battle, Armstrong and his companions became stronger and understood themselves better. They decided to continue exploring the ruins in search of more treasures and secrets until they achieved true victory.
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There's no way to tell without more information. They could be completely fictional, made up to entertain or to teach a moral lesson. Or they could be based on real events that have been exaggerated over time. Maybe in some Caribbean schools where obeah has a presence in the local culture, there could be some real - life incidents that inspired these stories, but it's just as likely that they are pure fantasy.
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.
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.
One way could be through the power system. The EMS (Eternal Mangekyou Sharingan) from Naruto could be a unique power that a character in the High School DxD world acquires. Maybe a transfer student from a hidden ninja village arrives at the high school and has to keep their EMS a secret while dealing with the devils and angels in the school. This could lead to some interesting battles and interactions as the powers of the EMS, like the ability to use powerful jutsus, contrast with the magic and abilities of the High School DxD characters.