Hello everyone, and welcome to my new fanfiction, as you might have seen already this will be crossover mainly consisting of the Harry Potter and High School DxD fandoms. There will be influences and maybe some characters from various other manga, anime or books/novels but that will become apart later in the story.

Just a heads up, this story will take place in the world of High School DxD just mainly edited to fit my needs and wants. The main Character Harry/Hadrian will have his own peerage but I'm sorry to disappoint you in the fact that I already have that one planned out.

I hope you'll all enjoy the fanfic but let's get on to the story,

Chapter One – The Phenex

Harry had been reborn, yes, you heard me correctly he had been reborn, in a different world no less. Harry couldn't really explain it himself, he had passed away, he could recall a meeting, speaking with a darkly cloaked being who he assumed was Death or a personification of the being and then being born again.

And let him inform you that being pushed out a woman her womb whiles you're aware isn't really a fun thing. But it had happened to Harry, he had been reborn to Ruval Phenex and Emillia Paimon, his new mother and father.

Yes, you heard it right Phenex and Paimon like the two Devils from the Ars Goetia, the 72 Pillars of Solomon, that kind of deal. Because that is what they were Devils, he was reborn into a family of Devils and currently lived in the underworld.

Apparently in this world Angels, Fallen, and Devils existed besides many other divine beings and spirits that inhabited the human world unlike the biblical factions.

While it had shocked Harry or Hadrian as he was now called, he had adjusted to it fairly quickly, and from a young age had begun learning about the history of his new world and his place in it. Apparently, his grandfather was the current Lord Phenex, and Ruval his own father was the current Heir as the oldest of three sons.

Which naturally made Hadrian Ruval's Heir and the next in line after him to inherit the title of Marquis Phenex.

He had grown up Happy, Loved, he had met many interesting people, learned a lot of new things and was Happy, it was however on the day of his 12th Birthday, the day he would be gaining his own set of Evil Pieces that he regained a set of memories that had been locked away.

Flashback

"So… I've died?" Harry asked as he looked at the darkly cloaked entity.

"That is correct, you died on the field and now have some choices presented to you." It spoke.

Harry frowned, "Okay, what are these choices?" he asked.

"You could choose to pass on, move onto the afterlife and gain eternal rest." Death began, "You could choose to be reincarnated back into your own world without your memories and start life anew as a different person." Harry was honestly tempted to pick the first option but before he could speak Death continued.

"Or you could choose to move onto another world where you could be reborn as another person however, with your memories intact, in addition to that, the five people you connected most closely with in your last life would be welcomed into that world as well, and while they wouldn't remember at first after they meet you, they'll regain their own memories." Death finished as Harry stared at the being.

"You could- you could truly do that?" Harry asked gobsmacked.

"Normally no, but you were the only person in history to ever reunite the three Deathly Hallows, as a reward for that this is an additional option you gain."

"Could I… possibly know who will be accompanying me into this new world?" Harry asked cautiously.

"Yes I see no issue with that, the five people you may encounter again in your new life are Hermione Granger, Sirius Black, Remus Lupin, Severus Snape, and Tom Riddle Jr." Death said.

"Voldemort!?" Harry asked shocked, "Why him we weren't close at all!"

"You were, just not in the way you expect, you shared your body with a part of his soul for over seventeen years, this brings the two of you very close, he also used your blood to create a new body for himself connecting you in that way as well." Death explained, "He would also be coming back with a complete soul this time and not as the insane Dark Lord with horcruxes not that he could ever recreate those there where he is going."

"Alright…" Harry calmed down and took a deep breath. "I'll go with the third option then; I'd like another chance with those close to me." Harry declared firmly as the being in front of him gave a small smile.

"As you wish," Was the last thing Harry heard as he was suddenly engulfed in black.

Present Time

Hadrian sat up in his bed breathing rather harshly as he tried to gather his emotions together, while he had always remembered his previous life and knew he had spoke to the elder being he had never managed to remember what he had spoken about with the entity… but why now, why reveal it now. "Fuck, I wish things were just laid out for me plain and simple for once!" He half yelled before blinking as he heard a gasp from his door.

"Hadrian! We do not talk like that here." His mother Emillia said as she walked into his room. "What is the reason that you're using such language young man?" She said sternly causing Hadrian to blush and sink in on himself.

"Sorry Mother, I just had a really weird dream…" He trailed off.

"Oh, and what was this dream about?" She asked with a raised eyebrow as she gathered some of his more formal clothes for his birthday party that evening.

Hadrian had to think for a moment on how and what he was going to say but eventually decided to just twist the truth. "I had a dream about five people I would meet in life, people that would become close to me, but I don't know who they are or where they could possibly be."

Emillia had to think on that for a moment before nodding, "Well, maybe these people are future peerage members of yours, or just close companions, and if you are truly destined to meet, then you'll meet." She smiled as she ruffled his hair to Hadrian's annoyance.

She laid his clothes out for him on a chair before nodding towards another of the doors in his room, "Go and get ready, then I'll help you dress up for your appointment with Satan Beelzebub later." She said as she shooed him out of bed and towards his bathroom.

That was one of the things he had some difficulty adjusting to, luxury, he was now the Heir to an important family and thus was treated like such, lived in a large mansion with his family and had plenty of servants around that would assist him when needed.

Hadrian entered the bathroom and took a look at his reflection; his hair was now blonde like was common in the Phenex family however his eyes had remained a startling emerald green which glowed when he got mad or used a lot of magic.

He was also taller than he was in his previous life at his current age being 5'4 feet in height or 162 centimeters if you'd prefer. He also studied and learned a lot more as both the world's history and the magic he could now access were all pretty interesting and exciting.

After doing everything he needed to he exited the bathroom and made his way over to his mother who helped him dress in the small suit before she styled his hair, and wasn't Harry happy that his hair would actually listen when you did something to it.

"So, now you look like a proper young man." His mother teased as she smiled at him through the mirror. "Now, let's not keep your father or the Satan Beelzebub waiting." She said as she led him through a number of halls in their home only to stop and knock before entering the sitting room.

As Harry entered, he recognized a number of people his Father Ruval, his grandfather Reve Phenex and his grandmother Rayna Phenex, which as a side note was interesting that all current Phenex family members besides Hadrian had their name start with an R, apparently his mother was the person who chose his name and not his father who wanted to call him Reinier originally.

Alongside his grandparents he saw his uncle and aunt Raiser and Ravel, the latter of which was younger than Hadrian by a year and a half, his other Uncle was nowhere to be found however and was probably busy at work.

Sitting across from his father were Ajuka Beelzebub and Sirzechs Lucifer, who were the Satan in charge of the Technology Department and Domestic Affairs, respectively. Lord Beelzebub was also the creator of the Evil Pieces system and was the only person who knew of all its features.

"Ah, Hadrian, good of you to join us." Father spoke as he saw his wife and son enter the room. "Hadrian allow me to introduce you to Ajuka Beelzebub and Sirzechs Lucifer, two of the four Satans." His father said as Hadrian and Emillia walked over to sit beside him but not before greeting everyone in the room.

"It is nice to meet you Lord Beelzebub, Lord Lucifer," Harry said with a small bow before sitting down.

"Don't worry too much about formality today Hadrian, happy birthday by the way." Sirzechs said warmly.

Hadrian blushed, "Ah- thank you." He said as Lord Beelzebub also congratulated him before getting right down to business.

"Now, we are here to take you to get you registered as a King before getting your evil pieces." Lord Beelzebub explained. "Your family is free to accompany you but are also allowed to stay here if they so wish." He continued before looking over at the other people in the room.

"We'll accompany him." Ruval said, 'we' in this case meaning himself and Emillia as the others would be staying behind in order to oversee the preparations for Hadrian's party or ball later.

The Satan nodded before they departed through magical circle appearing in Lilith the capital of the Underworld where the Devil race resided.

When they arrived the had to walk a little before they arrived at a large monument where they stopped before the two Satans turned to face the group. "Now, what you should do is simple, place your hand on the monument and simply channel a tiny bit, doesn't have to be much, magic into it, this allows it to register you as a King and grants you your own set of evil pieces." Lord Beelzebub explained to him.

Hadrian nodded before approaching the large monument and cautiously placed his hand against it, he closed his eyes and concentrated as he called upon his magic slowly guiding it towards the stone structure before he suddenly let go as light came from the structure and something like a compartment or drawer opened up and within a small chest was placed.

Hadrian grabbed the chest and as the compartment closed again you couldn't even see where it had come from before. "Was that it?" He asked as he turned back to the group before gaining a nod from the green-haired man.

Hadrian opened the chest and looked at the fifteen pieces placed in four rows, with one place left empty where normally a king might've been placed. Suddenly Hadrian noticed something and frowned gaining the attention of his relatives. "Uhm… one of the pieces is a darker than the others, like something is swirling within it." He said causing the green-haired Satan to perk up and walk over.

Lord Beelzebub looked at the green chess pieces and noticed that one of the knights indeed looked darker in color and had some energy of some kind swirling within it. "Oh, it looks like you are quite a lucky young man." He smiled at Hadrian. "This is what one would call a Mutation Piece, it will allow you to reincarnate someone who would normally need multiple knight pieces with this one knight piece alone." He explained causing Harry to nod having read about mutation pieces before but also knowing they were pretty rare.

After they had arrived at home his grandparents had congratulated him on the fact that he could now begin his own peerage and the fact that he had managed to gain a Mutation piece especially since it was a knight and thus a useful piece.

His party that night wasn't too spectacular just a bunch of Devil Elite that wanted to make nice with his family and their children. It had been the first time that he had met some of the people there such as Sairaorg Bael, Sona Sitri, Seekvaira Agares, Rias Gremory and some others.

"So you take more after your mother then?" Rias asked as they were discussing their various abilities amongst one another, and even though Sairaorg didn't inherit his Clan's ability he did learn an interesting skill called Touki to enhance his own physical abilities.

"Yeah, while I of course have the Phenex Immortality and Fire abilities the Paimon Wind abilities come a lot easier to me for some reason. But I don't try to limit myself to them, I prefer learning various forms and uses of magic myself if I'm honest." He admitted.

"That is interesting, and could become an advantage in the future, but aren't you worried that you'll become a jack of all trades and master of none. It takes time to come to a high level in any skill it is the reason why many Devils prefer to focus on their clan trait or a certain style of magic or fighting." Sona added.

"You mean like you and Rias with how you both specialize in the Sitri Water Magic and Bael Power of Destruction, respectively." Hadrian asked.

"Yes, while we do know other spells and how magic works, we prefer to focus on our inherit abilities." Sona admitted as well.

"Yeah, I get that, and while I'm not trying to say that isn't good, I just prefer to have some extra tricks up my sleeve that no-one might expect from a Phenex such as spells related to water or ice, or from a Paimon in earth-based spells or even more physical combat even if I'm not that good in it I'd like to know how to properly throw a punch." Hadrian said.

"I can get behind that sort of thinking." Sairaorg nodded.

As Hadrian and his new friends continued talking Harry discovered that both he and Sairaorg got along pretty well and that while he didn't dislike both Sona or Rias that he felt they were a little spoiled, especially with Rias having gained her Evil Pieces a little earlier than most and already having two members in her peerage.

After the party died down and people began leaving Hadrian approached his parents with a question he needed to ask them.

"Mother, Father… I have something I need to ask of the both of you." Hadrian said as he approached his parents.

"What is it son?" His father asked a little bit concerned as to what his son would ask of him.

"I would like to start making trips to the Human world, I have heard from Rias Gremory that she and Sona when they are older will be allowed to go to a Human School in the Human World and I would like to go along with them. But before that happens, I would like to be allowed to make a number of trips to the human world in order to help me gather new peerage members." Hadrian said.

His parents looked at each other as if they were mentally communicating, which honestly, they probably were if you think of all the things Devils can do. "Well, we could allow it, both things… but the going to school with Rias and Sona will have to be discussed with Lord Gremory and Lord Sitri first although I don't think they'd refuse." His father said.

"And the trips to human world…. I'll or we'll allow it, but only if you take one of our own peerage members with you." His mother said rather sternly.

"Yes Mother, thank you Mother, Father." Hadrian grinned before hugging the two.

Thank you for reading the chapter, I would like you all to know once again that the peerage has already been decided. What I haven't decided yet however is who Harry or Hadrian will end up with.

I'll say it in advance, this Hadrian will be either gay or pansexual, and I'm still deciding on if it should be a harem or no, if it will be a harem, it will be under 10 people.

I'm still giving Issei his harem, but I will say in advance that I will not be posting any smut chapters, or not that I'm planning to no Lemons, maybe some Limes or something of the sort but nothing much.

This is because I myself am Gay, so I have difficulty writing straight smut even though I am working on getting better at it. Also, because I'm not yet sure what direction I want Hadrian to in with regard to his relationships.

- Raven Prince