Well this is my first ever fanfiction so I'm pretty new to all of this. Reading other people's fanfictions really inspired me to start writing my own. I had thought of this idea and decided that it would be somewhat of an original idea although the main character is OOC. I won't be describing how the characters look or what they are wearing much since you should know what they look like. Hope you enjoy!

Disclaimer: I don't own Naruto or High school DXD, they both belong to their respective owners.

"And now, let the marriage between Riser Phenex and Rias Gremory commence!"

"Hold it right there!" yelled out a boy. "Buchou's virginity is mine!"

Everyone looked at the person who had just crashed the wedding with varying expressions. Some people looked hopeful thinking that he would be the one to save Rias from her unwanted arranged marriage while most of everyone else just scowled at the boy.

"Issei, what are you doing here? I told you specifically to stay back and stay out of this!" exclaimed Rias looking worried that he may do something reckless.

"I couldn't just stay back while you are going through all of this! I'm probably the only one who can save you from your marriage right now!" explained Issei. "I felt so useless during the rating game, like I hadn't done much at all even though I have such a powerful sacred gear. But now I will show you that I'm not weak and beat Riser up until he has to cancel this marriage!"

"Oh really now, you think you can beat me up when you failed so terribly during the rating game?" taunted Riser. "A low class devil could not possibly hope to defeat a high class devil such as myself. You are not even worth my time so guards, take him away!"

Before the guards could apprehend Issei, Sirzechs Lucifer commanded the guards to halt and sent them away.

"Sirzechs, what is the meaning of this!" yelled out Riser "Even you can't even stop this wedding now! You are abusing your powers and are going against the contract that our families have written!"

"Calm down Riser, I just thought this wedding was pretty boring so I hired some entertainment. A battle between Issei Hyoudou and Riser Phenex, Dragon vs Phoenix, Talent vs Hard work! Now that is a battle that I think everyone would like to see wouldn't you agree?" said Sirzechs with a grin on his face.

"I don't think that is necessary since I am clearly the favored to win. It wouldn't be much of an entertainment if the fight is extremely one sided and plus, I have nothing to gain by fighting him." replied Riser obviously annoyed with how his wedding was turning out thus far.

"How about this Riser, if Issei wins then the marriage is canceled however if you win, then you gain full control of Rias' peerage meaning that you can do whatever you want with them."

"Sirzechs! You can't stake the lives of my entire peerage on this one fight!" yelled out a very nervous Rias. She had faith in Issei but not enough faith to put the lives of her peerage on him. They were basically family to her.

"Trust me Rias, all will go well and smoothly" replied Sirzechs trying to calm his little sister down. "So what do you say Riser?"

"I'll humor you and accept this challenge. But don't blame me if I put that low class devil over there in a critical state from our battle. Longinus user or not, it means nothing if the user is too weak." Said Riser with a smug grin on his face.

"There we have it folks, let the battle begin!" And with that everyone teleported to a stadium to watch the battle commence.

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(At the Stadium)

Rias and her peerage watched the battle with trepidation hoping that Issei had thought of a plan of some sort to win. Akeno seeing her King's troubled state tried to calm her down. "Rias have faith in Issei, he is the type of person who won't give up that easily."

"I know but Riser is practically immortal, how could he even hope to defeat him?"

Kiba called out to Rias and Akeno, "Guys the battle is starting."

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(At the Battlefield)

"Give up Issei this is a pointless fight if you know you are just going to lose."

"No! I have worked too hard to lose and have sacrificed too much! I will win and bring Buchou back with me, with all of us!" Issei screamed out passionately.

"So be it then. Don't lose too quickly now, entertain me."

Riser stretched out his arm firing a multitude of fireballs from his hand. Seeing this Issei jumped out of the way before activating his sacred gear and running at Riser

He leaned in for a punch just for Riser to move out of the way last second and grab ahold of his arm before setting it ablaze on fire.

"AHHHHH!" howled Issei feeling his arm being burnt to pieces. However he pushed through the pain and managed to punch Riser with his other arm which was enough to push him back and away from Issei.

Issei examined his arm finding it to be completely burnt and that he could barely move it at all. 'I think it's the best time to use my trump card now.'

"Don't you see how pointless it was to go against a phenex like me? You are nothing to me. In fact if it wasn't for your sacred gear, you King would have left you to die! It's too bad you are so weak that you can't even wield it to its fullest potential, you are practically useless to your King now!" taunted Riser expecting he had broken Issei's spirit enough that he would forfeit.

"Boost"

"Enough! What you said may be true but don't think that that will be enough to bring me down. I still have my trump card left and you are about to witness it."

"Boost"

"The one thing I was really ever good at was my determination to never give up!"

"BoostBoostBoostBoostBoostBoostBoostBoost"

"Explosion"

"Balance Breaker activate! Scale Mail!"

"Behold my balance breaker! This is it Riser, I will show to you my true strength!"

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(At the stadium)

Everyone from Rias' peerage looked at the scene in front of them with worrying expressions. Issei's arm had just been burnt to crisps by Riser. His chances of winning were diminishing by the second. But then a light appeared from within the battlefield to reveal Issei but in his balance breaker state.

Everyone was dumbfounded at what they were witnessing, even Koneko who rarely if ever shows her emotions.

"What! How could he have achieved is balance breaker, it usually takes years for someone to unlock their balance breaker yet he has only been a devil for a couple of months!" exclaimed Rias. "Just what did he do to achieve this?"

"He sacrificed his arm to the dragon" explained Asia who just so happened to be sitting next to her.

"ASIA? Since when did you get here?"

"Um I was here the whole time but nobody really noticed me…"

"Really? Sorry your small stature was really hard to notice with all of the drama that was going on." Said Rias in an apologetic tone.

"It's ok Rias-senpai, but like I was saying he sacrificed his arm to the dragon. Do you see what he is holding in his left hand?"

"A holy cross? Did you give him that for this battle Asia?" questioned Rias. All she got from Asia was a nod. "This stupid plan may actually work." Rias said hopefully.

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(At the battlefield)

"So what, you unlocked your balance breaker mode, big deal. You are still too weak to even face me, no matter how many times you power up. 0 times 1000 is still zero."

"Just you wait Riser, I'm going to wipe that smug grin right off your face!" And with that Issei rushed forward catching Riser off guard before punching him right in the face with his left hand.

'Got him! I wonder how he will feel being exposed to a holy object' he thought remembering Rias' lessons about the weaknesses of devils.

"It'll take a lot more than a punch to beat me" Riser exclaimed before rushing to Issei and punching him right across the face. He then grabbed on to Issei's arm before he could get launched backwards then pulled Issei back to him to knee him right in the stomach. Riser forcefully threw Issei right into the stadium wall leaving a multitude of cracks at the impact.

'How, how could he take a boosted punch right in the face with a holy object and get back up ok? Even the healing powers of the phenex clan are still weak to holy objects.' Issei wondered what was going on, he knew that Riser wasn't one to use close combat but instead just over power his enemies with his fire. 'Everything I had worked so hard for, the plan I had come up with was flawless. I was supposed to exploit his weaknesses so why wasn't it working?'

"Riser" looked at Issei's body with indifference. 'I broke most of the bones in his body so he shouldn't be getting up any time soon. I kind of feel bad for the kid, but I've gone through too much for regrets now.' "Well boy this is it." "Riser" said before activating the seals in his arms and launching a gigantic fireball straight at Issei.

Grayfia's voice was shaky but she still managed to say "Issei Hyoudou has lost, Riser Phenex has won the battle."

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(At the stadium)

"B-B-But how? How could Issei have lost, he had planned everything to the exact detail." Asia cried out. "Was it all for nothing?"

"No, this can't be. I've worked so hard to get out of this marriage yet I still failed. I'm sorry everyone, I've failed you as my king…" Rias cried out. Everyone there tried to comfort her but to no avail. Grayfia then walked up to the group and said, "Rias, it's time for the wedding. Please come quick." Then she walked away give Rias time to cope with her loss.

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(At the wedding)

Rias was horrified. This was her worse nightmare, being married to Riser Phenex. She tried her best to get rid of the marriage but to no avail. No matter how many sacred gear users she had, she could never get past the regeneration abilities of the Phenex clan. 'I should have spent more time researching about Riser and training my peerage instead of looking for more members, and now I'm paying the price for it.' Rias thought to herself looking back at what she could've done to prevent the outcome from happening.

*Knock Knock*

"Rias dear the wedding is about to start, come out" proclaimed a voice on the other side of the door.

"5 more minutes please" pleaded Rias not wanted to go out there and confront the inevitable.

"You've said that 4 times by now, you might as well get this over with don't you think dear?"

"Fine, I'm coming mom just – just give me a moment."

"Just be quick now, everyone is growing impatient by the second."

As Rias heard the footsteps walk away, she looked back at the mirror of her dressing room to examine herself for the hundredth time. 'It's now or never I guess, although I'd much rather prefer never' and with that last thought, she walked outside.

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Venelana Gremory was walking away from her daughter's dressing room thinking if this really was the right choice to make for her daughter. At the time it was a good idea to gain an alliance with the Phenex household and gain access to their prized Phoenix tears but now seeing her daughter's reaction to the whole thing made her regret ever signing the contract in the first place. Nevertheless, it was too late to turn back now.

Venelana walked up to the front of the stage and announced to everyone that Rias would be out in just a moment. She looked at the crowd nervously since they had been waiting for 20 minutes and were getting very impatient. They had to being the eating portion of the wedding early because of Rias. A few minutes later everyone saw Rias come out in her wedding dress. She was walking nervously with her head looking down at the ground still refusing to accept the outcome.

"Ahh Rias there you are, where have you been? Everyone has been waiting very patiently for you to arrive." "Riser" asked. "It's ok to be nervous since this is your very first wedding after all."

Rias didn't respond nor did she even look at him trying to still be defiant even though she couldn't do anything about the marriage. "Riser" walked to the front of the stage with Rias by his side and exclaimed

"Before the wedding goes underway, I would just like to propose a toast!" "Riser" said lifting up a glass of wine in his hands as did everyone else. "Today we are gathered here for 2 of the most prestigious clans to come together and unite as one! So please let us enjoy this wedding to the fullest!"

And with that final statement, "Riser" threw his glass down onto the ground and acting as a signal, smoke bombs burst into the room filling it up with its contents except that it wasn't smoke at all, it was poison.

As the purple gas filled up the room, all the participants started to cough heavily trying to expel the gas out of their system but to no avail. Some of the weaker devils such as Sai passed out instantly from the overexposure of the gas.

He looked on at the scene admiring his handiwork before he had to quickly step aside as a crimson orb flew past him. He looked at the person who had tried to attack him and noticed a few more people there with the man. 'So the 4 maous and the strongest queen have to come fight me eh?' he thought while analyzing the situation before him.

"Who are you and what is the meaning of this!" yelled out Sirzechs who was not only furious at the fact that her sister had lost but now at the fact that this person had the audacity to attack them at an event such as this. "What have you done to the real Riser Phenex?"

"Sirzechs you must calm down, we are facing an unknown enemy who could disguise himself as a high class devil without any of us even knowing. We do not know what he is capable of and plus there are most likely more people involved in this attack to pull off a stunt such as this." Grayfia told Sirzechs.

"It doesn't matter, I am the strongest devil so I'm pretty sure I can take him down very easily. Plus all of us together should be more than enough to beat him." Sirzechs replied arrogantly although he had every right to be.

"So I guess the poison doesn't work on Ultimate class beings such as yourself, a shame really. Guess I will have to ask Kuroka to enhance the effects more I guess." The man said to himself before smoke enveloped his body revealing a tall blond man with 3 whisker marks on each side of his face. "Well this is going to get interesting don't you guys think?"

"So you are working with Kuroka as well I see. Well no matter, we will just have to take both of you out." Sirzechs said forming his trademark Power of Destruction in his hand.

All of the other maous did the same preparing to take him out when suddenly the man grabbed ahold of Rias and pulled out a holy sword in his other hand and held the sword up to Rias' throat. "I don't think you would want to do that Sirzechs, I mean what if your precious little imouto got hurt or better yet, killed by me" the man said with a dark smile that was etching on to his face.

"Why you coward, unhand her right now!" Sirzechs exclaimed trying to think of some way to save Rias. Grayfia then whispered a plan into his ear that just might work.

"All right Ajuka, Falbium, attack him with everything that you have!" roared Sirzechs before launching his own attack at the man only for him to barely avoid the massive attack that was sent his way.

"Now Grayfia, Serafall!"

All of a sudden ice pillars formed right around the man and Rias before encasing both of them in ice right where they were standing… at least that was what they thought would've happened. Instead before the ice could even get close to them it was stopped by a barrier of some sort.

"Did you really think that I wouldn't have come prepared for any and all possible threats? I think you have underestimated my planning into all of this." And then he stomped his foot on the ground revealing to the group the many runes that were inscribed there. All of a sudden a purple barrier encased the group.

"I wouldn't try that if I were you." Said the man seeing as Serafall was about to touch the purple barrier. He then threw his sword right at the group but before it could reach them, the barrier completely disintegrated the sword into nothingness. "No need for this hostage anymore" said the man as he unceremoniously threw Rias' unconscious body to the ground.

"You bastard! I swear once this is over I will hunt you down and kill you for what you have done!" Sirzechs growled at the man seeing him throw his little sister to the ground.

"Yeah, Yeah, you're going to hunt me down and kill me, whatever. You know, when you hear that phrase a thousand times, it starts to lose meaning. Now I know that you may have a ton of questions for me and I will answer them in due time."

"First off introductions, my name is Naruto Uzamaki and yes I have been working with Kuroka. We are actually in the same faction as one another called the Khaos Brigade lead by none other than Ophis herself." The now proclaimed Naruto explained.

"Now you might be wondering why I'm telling you all of this information and well the reason is that we are starting to put our name out there for people to see. Call it a publicity stunt of some sort to get more people to join our cause ya know? But that's only part of the reason, the other part is that I need access to Ajuka's laboratory here. It contains a lot of information that Ophis needs.

"And why the hell should I tell you anything Naruto?" Ajuka said with a scowl on his face.

"Well you see here, I have all of the cards in my hands. Every single high class devil family came here to witness such a grand event only to find themselves unconscious from the poison that is in their bodies. I've locked this place down with my group so nobody is getting in and they sure as hell aren't getting out. This type of poison can knock a person unconscious in a couple of minutes before killing them in about 5 hours… ish. And I could keep this barrier up for however long that I want to so we can definitely play the waiting game." Naruto explained slyly. "And since I am the only one who has the antidote for said poison, I'm really your only hope for saving everyone here."

"Don't think you can intimidate us, I'll find a way out of this barrier and once I do-"

"Ajuka… just do what he says." Sirzechs sighed out. "He has us trapped and I can't and won't risk the lives of everyone here."

"He's right Ajuka, just do what he says. I can't find a way out of this barrier and using our powers won't be any good either." Grayfia calmly said. "He's got us right where he wants us."

"Fine…"

"My lab is in the familiar forest, just past Tiamat's cave who is on constant guard for any and all intruders. Your poison won't work on her since she's on the same level as all of us here so don't think you can get past her so easily." Ajuka said.

"Well your so called "guardian" has been taken care of beforehand so no need to worry about that."

"What? How did you get past her so easily, she is the strongest dragon king?"

"I sealed her inside the cave indefinitely before this all went down. Pretty easy as well seeing how she never even notice that I was there in the first place." 'Although maybe that was because I was disguised as Ajuka.'

This was bad, if this person could take down Tiamat so easily then there was no telling what else he could do. Then Naruto held his hand to his ear revealing an earpiece and retelling the information that he was given.

"Well my guys are making their way to your lab so I guess we are done here." Naruto said before releasing the purple barrier and tossing Rias over to Sirzechs. He caught the girl examining her for any injuries of the slightest and was relieved when there was none.

"And the antidote?" Ajuka questioned.

"Oh that's right, almost forgot." Naruto said before reaching into his suit and pulling out a small vial that contained a blue liquid, presumably the antidote. He then tossed the small vial over to Ajuka who swiftly caught it before it could reach the ground.

"What is this?! This is not nearly enough to cure 1 person let alone everyone here!" Ajuka yelled. "I thought we had a deal?!"

"And I fulfilled my end of it! I gave you the antidote but I never specified how much of it I would give to you. You're the genius here, mass-produce more of it." Naruto said as he started to walk away before being intercepted by a wall of ice in front of him.

"If you think we're going to let you get away after all of this, then you're wrong." Serafall said being surprisingly serious for the first time in her life.

"I didn't think I would either, but that's why I have plan B on my side." Naruto said smiling before stretching his arm out. A huge mass amount of energy bubbled at his hand before it launched out in front of him creating a portal.

"Now I don't know if you guys can survive the harsh conditions of the dimensional rift but luckily for me, I can. See ya all later" Naruto said but before he could walk into the portal a voice cried out to him.

"Wait! Before you leave, what did you do to Riser Phenex?" questioned Sirzechs. While he may not have liked the Riser, he was still the son of his parents' best friends and they would be saddened to see him not return home to them.

"Don't worry about Riser, tell his family that they will see him very soon." Naruto replied darkly before walking into the portal and disappearing. The portal closed right after his exit to show them that he was actually gone. Not a sign that would reveal that he was ever there in the first place.

"Sirzechs, what do we do?" Grayfia called out to him. It took him awhile to get his bearings but when he did he issued out his commands.

"Ajuka, go to your lab and mass-produce more of the antidote while I'll check on Tiamat. Falbium scan the area to see if there are any more of his followers lurking around. Serafall and Grayfia will tend to the people here." Sirzechs commanded. He needed to start damage control immediately to regain whatever control of the situation that he could.

"HAI!" everyone said as they set out to do as they were told.

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(Unknown Area)

Ophis was enjoying her usual silence of solitude in her room alone. Silence was all she ever wanted in the dimensional rift until Great Red came in and ruined all of that. So obviously her next plan of action was to create a group combining all of the most powerful people that she could find to expel the dragon out of the dimensional rift. But she needed something bigger, something greater. As crazy as it would sound, she was planning to unseal 666 before transporting it to the dimensional rift causing it to rampage and making it fight Great Red. She then would launch a full scale attack on both of them at their weakest hoping to get rid of Great Red before she would seal it once again. At least that was the rough draft of it since it was not completely going to work out the way she wanted it to but she needed to have somewhat of a plan first. She needed to start small though so she decided to gather as much information as she could before making any final decisions on her plan.

"Hey Ophis, I'm back from that mission you gave me." Cried out a voice. She heard their footsteps come closer and closer to her. When they finally got to her she recognized their face, it was Naruto her personal assistant and one of the very few people she could trust.

"Hello Naruto, did the mission go well?"

"Yeah, everything worked out perfectly. A little too easy if you ask me, I mean I infiltrated the place and set up everything without getting noticed or caught whatsoever."

"Well you do specialize in missions such as this one due to your abilities."

"Yeah, I guess. Well here are the files. I'll be going now, I've got to talk to Kuroka and thank her for the poison that she gave me."

And with that he walked away. She looked at the files that were on her desk and briefly skimmed over them. She relaxed back in her chair thinking about what her next step would be. 'The current Lucifer will probably contact Azazel and Michael about our group. Things will only get harder from here but that is just a given.' Ophis sighed relaxing in the comforting silence before she closed her eyes and went to sleep.

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(Phenex Household: 2 days after the attack)

The Phenex household was in shambles after the incident. There was no signs whatsoever of Riser and even though she was told by Sirzechs that everything would be ok, she felt like it wouldn't be.

*Knock *Knock

"Come in."

"Lady Phenex, a package has arrived for you." Said one of the maids working at the household.

"Who sent it?"

"It doesn't say."

"Alright just leave it on my desk."

After performing her task the maid quickly left to resume whatever duty she was working on beforehand. As Lady Phenex was approaching the box she had a bad feeling. She didn't know anyone who would give her anything during this time as every other devil household was still recovering from the attack. Lady Phenex thought of the worse possible option as to what could be in the box. So she carefully opened it and shrieked.

"AHHHHHHHHHHH!"

Lord Phenex, her children, and the servants came rushing quickly to her trying to understand why she was screaming.

"Dear, what's the matter?" asked Lord Phenex.

"R-Riser i-is dead." She said before revealing what was in the box.

Inside the box was Riser's head with a note attached to it that said

"This is only the beginning. We plan to do just more than attack the 4 maous, oh we plan to do so much more. Beware and hope that our paths never cross."

Sincerely, the Khaos Brigade

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END

Well I hope you somewhat enjoyed the story. Please leave a review as that would be much appreciated and I would very much enjoy a lot of criticism or advice on how I could better improve on my story writing. You can leave a hate comment if you want but if you do, at least explain why you hated it and how I could improve.

Next chapter will tell how Naruto got into this world and why he is in the Khaos Brigade in the first place.

Have a nice day!