I gotten inspiration from Fire & Ashes. Instead of Grayfia falling in love with Sirzechs, she fell in love with a mortal man (Naruto obviously). The thing is this man is known by the Three Factions as the Blue/Azure Knight or Knight of Life and Death.

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Night

The stars shine, the moon was full as the night sky illuminated the earth. Normally it was show of a beautiful array of consolation/show. Unfortunately, the beautiful night that most would enjoy is nothing more than help illuminate the ground as the sounds of battle cries and screams are heard throughout the land.

In one valley, the sounds of fighting was heard everywhere with the clashing of swords, shields, and crying pain. The battle was coming from three separate armies from three separate groups of supernatural groups.

One group was that of light that came from Heaven, led by the Biblical God, the Angels. The second force came from the Underworld, led by the Four Great Satans, the Devils. Finally, the third group, that was consisted of fallen ones, led by the strongest of all Fallen ones, Azazel, the Fallen Angels.

The Angels originated from heaven who are powerful beings that serve the Biblical God and have the power to inflict pain upon devils/demons due to their light-based powers. However, as powerful as they are, they are pure beings that follow the ways of the Biblical God has set.

The Devils come from the Underworld, where they were led by the Four Great Satans: Lucifer, Leviathan, Beelzebub, Asmodeus. They are strong since they use multiple dark magic (such as ice, fire, etc.).

Lastly, Fallen Angels are angels that have fallen from the grace of God, due to having "impure thoughts" that divert them from the teachings of the God in the Bible. They call themselves the "Grigori" group. They looked like Angels, except their wings are black and have no halos above their heads.

As the battle continued on, in the center of the battlefield a sudden explosion of such power suddenly appeared pushing all three side back a bit. The ones that were in the center of the explosion where killed while those that were knocked back wondered on what it was. It was suddenly one of the fallen angels yelled out loud while pointing his weapon into the sky, getting all those close to the person to look up and pay attention.

Suddenly, a sapphire flame, with glittering red sparks coming from the end of its tips, came down on the battlefield by the light of the moon. The flames soon disappeared as it slowed down to reveal an armor body with 4 pairs of Azure, silver angel like wings that looked like it's made of steel. The body was armored in a unique way. Like a knight of middle ages but was designed differently with the body being white. The chest plate was black as night with a red and blue outlines in several parts. His right arm held an Excalibur with its sheath behind the back. On the waist, there were two small short swords like daggers with their sheaths that stop mid-thigh. (X20A Strike Freedom: Gundam Seed but more middle age). When each members of the armies saw the suit of armor fly down from them, the commanding leaders knew who it was.

"It's the Blue Knight!" one Devil said

With the arrival of the Blue Knight, several of them stopped fighting with each other, where they turned their attention to the new comer. To the three factions, the knight is considered to be an enemy. For the Devils and Fallen Angels, the knight has slain several of their promising and prodigy members. The Angels needed to kill the knight because, even though the knight fought against Devils and Fallen Angels, the knight also defeated several members of the elite Seraph, recently Michael.

The Armies quickly engaged on the knight but the knight moved so fast that many didn't see where it flew. The knight flew with incredible speed and agility that many believed it was teleportation of some kind. The knight quickly flew into the center of the battle where he started to shoot energy blasts of holy and demonic powers on all. The accuracy was incredible that the knight shot only at the arms, legs, wings, and non-vital areas where it won't cause death. In one point, it fired several shots of magical beams at everyone, taking them out of the battle.

It was around this time that the current commanders of battle came towards the knight. The knight saw this and flew into the sky where the commanders flew up as well. The battle of the three vs. the knight was intense. The commanders of the Angel and Fallen Angels have 5 pairs of wings, while the devil was known to be at the same level.

The knight fought each three with incredible skill and strength that many down at the battle field actually stopped to see the battle. Through great skill and determination, the knight slice right through the Fallen Angel Commander in half with its Excalibur, impaling the devil with the same sword while fighting the angel a bit more before they fired upon each other where the knight blast through with a second shot that continued on and hit the angel's right arm and two wings while the second shot hit the left leg and two lower wings.

With the final commander taken out, the second in commands saw that knight was ready to continue fighting as it came down on them. With this, they ordered each of their forcers to retreat since their main commanders were defeated and the battle became unfavorable to them as well as to report the incident to their higher command. Most retreated while others stayed in hopes to turn the battle in their favor, Devils and Fallen Angels, but where quickly silence by the Blue knight. With the forces temporally withdrawn from the battlefield, the Blue Knight quickly flew into the full moon and disappeared.

The Blue Knight, or the Knight of Life and Death, is an unknown, legendary warrior in the earth as the knight appeared nearly ten years ago. None of the three factions knew doesn't know on who the knight really is since the aura of the knight always disappeared like the shadows and would only appeared when the three forces would battle each other near land that were in habited by Humans such as Kingdoms or small Villages. During those times, the knight would enter in the middle of the battlefield and fight everyone that it can possibly can. The three factions already knew that the knight's power was that of a Sacred Gear, but they haven't got a clue on where it appeared or who created since God, himself, never created such a thing. They believed it was created by something else or a longevity that was hidden in the world. The only thing that was certain was that the Blue Knight was danger to the three factions since it attacked anyone and barely left anyone alive, except the angels but they receive serious injuries.

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1Year later

It was the final battle, as the armies of Heaven, Underworld and Grigori group fought in a tremendous battle on the earth, so tremendous that any living human that was nearby would be scorched alive from the holy/demonic aura clashing at each other for three days straight.

As the battle continued on, in the middle of the rampage a large, ring like, circle was occupied by only 10 beings. The ten beings that were fighting each other were the five top leaders in Grigori, the Four Great Satans, and the Biblical God of Christianity.

The fighting between the leaders were so powerful that many couldn't get near, that only their top generals or right handed men were able to get in. But as the battle continued to go on with the deaths of many brave warriors, the battle changed dramatically as out of nowhere the three factions were completely struck by a powerful blasts that created a path. It was then that those that paid attention saw the Blue Knight appeared again. Those that saw it, attack in all directions but weren't able to hit the knight since the way it flew was made it impossible. The knight flew directly at the center of the battlefield where God and the Satans were fighting with each other.

Knight brought its arms up in an X-shape where a barrier shield appeared and collided into the wall of powers to break through. Once in, he saw the deities and began its assault on each one of them.

The Four Great Satans saw who it was where they heard on the Blue Knight. They knew if the knight didn't get itself involved in several past battle, they would have gotten an upper hand on the war. They knew that the knight had to die for ruining many of their plans.

The Fallen Angels saw the knight and had similar thoughts were they too had to kill the Blue Knight.

The Biblical God, who was three times taller than any man, knew the knight from the reports from his subordinates, including Michael, that he was responsible for injuring his angels in battle, not killing any of them. Like the Satans, the Knight stopped several advances in the past that it caused them to advance their attacks on the Devils and Fallen Angels.

The Battle continued on as the forces of each factions attacked each other, including the Blue Knight. In the battle, the Knight had taken down the top commanders of each group, including Michael, but not without sustaining severe injuries, several armor plates were destroyed and blood coming out from inside the armor. But even with great pain and lack of energy, the knight continued to fight until only the knight, the Four Great Satans, and God were the only ones to be able to keep fighting.

It was around this time that God and The Satans decided to make their final attack on each other but stopped when they saw the Blue Knight sudden become Golden. The next thing that happened was only the top commanders, which were still alive, see what happened next.

The Knight new transformed state quickly moved with such speed that no one saw what happened until it was too late. In this one move, the knight flew behind two of the Great Satans and pierced their hearts with its bare fists (no gauntlet real skin), killing them while their black blood splash around. Everyone was shock on what just happened that the other two Satans didn't know on what happened until it was too late.

The knight pulled out its hands from the Satans body and quickly moved and fired several energy shots at everyone, forcing them to scattered. It was then that the last two Satans were caught in surprise as the knight drew out its Excalibur and slice then plunge deeply into the last two, killing them while the black blood from them splash all over the knight.

God and the Fallen Angels couldn't believe on what just happened. They of course figured out that this power must be a special "God Killing" mode. In less than a minute, the knight killed the Satans but suddenly dropped to the ground near the leader of the down Fallen Angel, Azazel. The Armor of the Knight has all but disappeared as the only thing left was the face mask. The knight was completely weakened that it couldn't move at all.

The biblical God was the only one left to be able to move. He walked, with a sword in hand, with an ominous present in front of Azazel and the knight. The God approach them as Azazel looked up at his former leader.

"Hahahaha… guess this is it for me huh?" Azazel said with a grin on his face.

"You have betrayed the path of light with your desires and rebellious actions. I'm sorry to say that it is time that you pay for your sinful ways." God said

"Hehehe… before I go… you mind if you show me on who the Blue knight really is as I'm just curious as you are." Azazel requested

God didn't acknowledge Azazel, but was curious to know on who the knight is. The almighty God walked and lifted the person by their neck with his left hand. God pulled and threw the knight's armor mask away to reveal the person's face. God and Azazel looked to see that it was a young boy in their late teens to early twenties with blond spiky hair. The boy had a face that could attract many young women to him.

God examine the boy to see on what this boy power's really is but couldn't find an answer since he can sense a sacred gear but wasn't able to tell on how it was created or where it originated but could feel a familiarity that he couldn't put.

Azazel looked at the young boy and could see that he was out cold, wasn't able to defend himself. As he stared he heard God speak up.

"Strange… I can sense both light and darkness in his soul, yet can't sense any evil or good in him. But in any case, he must be punished for his sins." God said

"Oh… and what sins would that be… he killed many devils and Fallen Angels while leaving only injured angels to you. The way he fought, you should be thanking him for killing your greatest enemies." Azazel panted out on what he said

"He still sin by hurting my loyal ones and stirring people away from my lessons of purity. I will assure that, like you, he will not find peace. Just like Adam and Eve, he will face my wrath for all the sins he has place upon himself." Where God has his sword, in his right hand, ready to pierce through the young man's heart.

"I guess this is it." Azazel thought as he closed his eyes to not see the death of the young boy and waited for his turn.

The next sound that he heard was a piercing and splashing sound. Azazel sighed as he opened his eyes, to see God one more time. He thought he should go out with at least one more act of rebellion, not matter how silly it is, which is why he was ready to spit on God's face. However, when he opened his eyes, he was not prepared on seeing this scene.

Azazel looked stunned at the unbelievable scene in front of him. Michael and the other Seraph Angels were finally able to come out of being unconsciousness to see on what happening. It was there in their own horror and disbelief on the scene in front of them. The High ranking devils that were there also, that weren't killed by the knight, finally regain consciousness

God had his sword ready to strike as he brought the young boy in front of his face that held an angry yet sadden face on him. He held the boy straight as he got his large sword ready in one motion. It was here that he began his thrust to only stop right before the tip of blade could touch the boy's chest since he felt something was wrong. He looked down to see the boy, in his right hand, holding a golden dark sword with a similar aura that killed the Satans. However, along the blade had the blood of the Four Great Satans covered the blade as it pierce God's heart.

In that moment, God fell on one knee then on both where he let go of the boy, who regain consciousness just in time to put all his strength to create the golden/dark sword that killed the Satans along with their blood to pierce God's heart. God's grip of the boy loosened up as he fell on top of him as well as letting go of his sword. Everyone then heard whimpering and huffing. They then saw that it was the boy as he was crying.

"I-it's fina-finally over…" the boy said as he his tears ran down, "… I-its ti-time-me… tha-at… yo-you…p-paid… f-for… y-y-your s-sins… m-my l-lord." stuttered the young boy where everyone, including God himself, widen their eyes at what the young boy said.

(Naruto Shippuden OST: Decision)

As God's life began to fade away, he saw the boys eyes to see nothing but pain, saddens, all the feelings of sorrow. Before he could say anything, the boy continued on.

(You add the stuttering, whimpering talk here)

"You have to die… for all those who believe in you… for all those who had faith in you… for all those who continue to worship you… and for all those that despise and hated you…" he cried out as more and more tears ran down his face.

"You're supposed to be the bringer of hope and peace… to show us the way to save our souls… and yet… you let so many suffer because of your war. For a hundred years, so many have prayed to have them answered… yet at the same time… you have failed to help those who asked for your protection where they… abandon you. You can feel to… can you… this power… the power of Humanity… the power of light and darkness... the hopes and rage of all the people in your world." He cried out

It was at this moment, God could hear from the boy's sword the voices of the blissed and anger of the rejected that followed his faithful words.

"I thank you for blissing my family with this meal my lord…" said a young woman praying to him in bliss.

"I prayed for you and you do not answer me… I have faith that you will deliver us from this darkness. Or are you testing my faith after I lost my family… I pray to you to give me back my children at least… Please my lord…" said the same woman as she cried out in sorrow for the death of her children

More and more cries of sorrow and anger continue as more and more thanks for the blissing that they received by them. There were so many people with their hopes and their hatred for him that even he couldn't help but be amazed on it. It was there that God know knew what this power was. This power was the hope and despair of Humanity, where their hearts finally gave birth to their own savior and avenger.

"And I… I have suffered as will… I lost my family but gain friends… I lost my friends but gain a new home… and so forth… I had to listen… listen to all of them cry out in pain for your help but never received it… I had to watch as many lived in pain or grief… It was there that I decided to fight and in that fight… I felt it… I could feel a powerful force taking me and then I waken with this power. I then knew what this power was for… that's why I did what I did… and now at what am I doing… I had to use this power to kill the Four Great Satans… and you…" the young boy cried out

"I had to kill you or the happiness and pain of those who are or were sacrifice in your name in this war of yours can finally rest in peace. That's why I was given this power… this power to slay you and that's my decision as one of your children… since… since… you force me to do this." The boy finished as he continued to sob.

All those around the two couldn't believe on what the boy has just cried out. In a way, what the boy was saying was actually right. Their thoughts stopped as the boy continued on.

"You… you… forced us… all… to create… this… power… and… for me… to carry… the burden… a burden… that I will never… be… forgiven… and… that's why… even now… I hate you… but still… I ask you for forgiveness…" the boy as he cried louder like a child.

God's long white hair covered his eyes that only the boy could see his face. God brought his right hand at the blond's face while his mouth began to bleed out while his blood continued to leak out from the sword, where the blade finely pierced all the way through his body. With one last breath, God lowered his face to the boy where the boy widen his eyes for a moment as he began to cry even harder. It was then that God's hand on the boy's face fell to the ground as he gone motionless. The boy huffed a bit more before he screamed so loud into the sky above him. With one quickly and violent motion the boy swung his sword up, creating a large slash out of God's body where his blood hit his own body. With that God's body was thrown of him and landed face up, dead.

The boy looked at God's, now, dead body with his sword held in both hands above him, which he shook in sorrow. His tears continue to pour out before he decided to just leave. He used whatever strength he had left to change his sword into a pair of his wings and flew into the night sky. Michael, Azazel, and the Devils tried to get to him but he had already left.

(End OST)

The armies outside the circular ring felt the sudden loss of the Satan leaders and high ranking Fallen Angels where the Angels cheered while the Devils and Fallen Angels shook in disbelief knowing that if their leaders are dead than God will come out and kill them. But before anymore thoughts could come up, everyone felt God's life fleeting before it disappeared as well. Everyone around was shock on what they were sensing. It wasn't long before they all saw one figure fly away, where they saw the Blue wings, knowing that was the Blue knight.

Not long after sensing the loss of the leaders, everyone paid attention to the center of the battlefield to see Michael, Azazel, and the devils walked out. Before things could go along one Fallen Angel yelled out to his fellow Fallen ones to continue the fight since he can see from the expression on Michael and his subordinates, along with the devils, that both God and the Four Great Satans were dead. The Fallen would have attack but Azazel stopped them, saying that there is now a ceasefire on all sides.

When the knight left, Michael with his fellow high ranking Seraph, Azazel and fellow surviving comrades and the devils walked to the center of the fallen leaders. Gabriel ran towards God's body as she held him close while crying out in disbelief. The blond beauty cried for the loss of their savior while Michael and the other angels looked sadden for their loss. The devils were also sadden for losing their leaders. It was then that Azazel took pity and called for a ceasefire on all sides where they agreed since they all want to mourn for their loss leaders.

With the announcement, all of them were hesitant but then saw the bodies of God and the Satans being carried out. The Fallen Angel that wanted to continue, Azazel stopped since Azazel was the commander of the Grigori and ordered all his comrades to head back to headquarters or any of their bases for further orders. In the end, the Great War had finally ended in a horrible way.

Far from the battlefield, the young blonde finally landed in a remote region that used to be a battlefield from the three factions. He walked up to several graves where he continued to cry since in front of him was the graves of his family; father, mother, brothers and sisters. The night was filled with nothing but tears of pain and morn.

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Till Next Chapter

Also, I like to point out that I will be releasing new chapters for my other stories at random since I'm being moved by what kind of inspiration in my head. So don't get all whiny about it and just wait for any other update which can be at any time.

Finally, I'll reveal the history of the young blonde (which you guess is Naruto) and how he achieved his powers in a later time.

The Pairing at first will be Naruto and Grafia since this happened in the past. In the future, Naruto will be paired with Grayfia, Serafall, Rias, Akeno, and possibly Gabriel. Relationship on Grayfia and Sirzechs along with the birth of their son later on as well.