Heaven, 4000+ years ago
Long ago, before the time of the current events, back when Lucifer, Beelzebub, Leviathan and Asmodeus were the Maou of the Underworld, and back when God of the Bible existed, a "small" event happened.
We've all heard the story of the apple, the forbidden fruit, Adam and Eve, Samael the snake, and the Garden of Eden. However, another story that was buried far beneath the records also occurred. The Garden of Eden was as you'd expect, a beautiful garden in Heaven that God himself created. At this time, a war between the Three Factions had not happened yet, so they all kept to themselves. However, Lucifer, the Maou in the highest position of power in the Underworld wished to defeat God of the Bible, and made an idea to break into Heaven.
As such, he found himself in the Garden of Eden, or rather right outside of it, as an Angel stood in his way, with the name of Gadreel. This Angel was given the task of protecting the garden from evil, from God himself. However, Lucifer was able to trick his way into the garden, preying on Gadreel's innocence as a young Angel.
Lucifer ended up rupturing the garden, causing the whole ordeal with Samael and Eve, and causing humanity's corruption, thus instigating the war between factions.
After the events of the first war, Gadreel was imprisoned in Heaven's most guarded prison, for treason and working with a Devil.
God of the Bible looked the same back then, a well-built older looking man with a long white beard, white robe and a golden aura. He was looking into Gadreel's prison with stern eyes, as Gadreel was chained up, sitting on the floor.
"You know what you have done wrong." God said.
"...I've said I'm sorry. Aren't you supposed to be a God that is all-forgiving?" Gadreel pleaded.
God turned around and sighed. "Do not mistake this, my son. This hurts me as well, but you must learn your lesson and be an example for all."
Gadreel froze for a second, then let his bangs cover his eyes, and made a creepy smile. "So that's how it is huh? Well when my time is up-"
God turned away, hiding a painful face as he spoke. "...There will be no such thing my son. I have sentenced you to an eternity in prison, along with cursing you to never fall, in order for you to reflect upon your mistakes."
"HAHAHA!" Gadreel began sadistically laughing at the top of his lungs for quite some time, as if he got a kick out of that. "Oh you conceited old man. That's truly hilarious!"
God started to walk away, not wanting to hear anymore of this, but froze as soon as he got to the door.
Gadreel spoke in a low and serious voice with a face full of bloodlust. "Of course I will get out. It may take a century, or two or even ten... but this... this cage will not hold me. Oh, and here's a sneak preview for when I do get out... everyone will die. All of them. And do you want to know how? I have one name for you: 666."
The outskirts of the Underworld, present day
Far outside of the populated areas, Georg who looked severely injured, and was missing an eye, carried an unconscious Leonardo in one arm, and had Cao Cao slung over his back, who looked pale and also hurt.
Cao Cao was not unconscious, but rather had a damaged pride, after Issei defeated him in front of everyone, and then his True Longinus declined him for using the Medusa Eye. Not only then, Issei had used Samael's curse on the eye, thus poisoning him.
After a while of walking, a familiar God appeared from the sky, and landed next to them.
"...Indra." Cao Cao weakly said.
"You look pathetic Cao Cao. You prepared so much, but did the plans of the Hero Faction fail due to betrayal, or due to something unexpected? You even had three of the four top tier Longinus get crushed." He said while crossing his arms.
Cao Cao coughed up blood and had a smile that mocked himself. "...Yeah. Either way, it's a surprise to see you come down here to the Underworld again."
Ignoring his comment, Indra continued with an increasingly annoyed voice. "The Sacred Gear possessors who achieved Balance Breaker and Longinus' are out of function. And you, Georg, and Leonardo can't be active anymore right? What are you going to do?"
"…I will rebuild it. The new Ophis will be born, so I will create a new Khaos Brigade by having that as the center of it. –But because of this incident, we have lost quite a lot of man power. For a short while, I will be hiding myself."
"Do you really think that? Your face right now doesn't say that. –Your face is that of someone who had their soul crushed. You got crushed by the Two Heavenly Dragons right? Samael's poison. Even if you do cure it, it will leave an after-effect you know? You are just a human after all."
"...Being crushed by the Two Heavenly Dragons huh... I won't deny it." Cao Cao said as he coughed up more blood.
"You sure look pathetic. So what did you want to become after all? A hero? A man of valor? Or a villain? No, did you become greedy and want to become all of them?"
"…For me who was born as a descendant of a hero while also being the possessor of the ultimate spear, this was the only path available for me. The only option where I had to fight against the superior beings…"
"Hahahahahahahahahaha! You idiot! Listen to the words of God that aren't so nice. Okay then? People like you who usually have B-class powers but get S-class powers when serious are quite common. The problem is crazy guys who have B-class powers in usual times and when they are serious, but gets SSS-class powers when they need to finish it. These guys are the most troublesome. In a battle where we could definitely win, they reverse it with unknown things. –You tasted that yourself right? Yeah, that Sekiryuutei is that type of guy." Indra said with venom.
"..."
"If you want to win against types like Sekiryuutei, then you have to show enough power where you can alter destiny itself. After all, your peer Longinus possessors are that Sekiryuutei and Hakuryuukou. –Maybe you were born in the wrong era?"
"Next I-" Cao Cao started.
"Next? HAHAHA. There isn't a next time. You end here. You know that you are worthless after being rejected by that spear and receiving the curse where you can't move anymore?"
"...Then what are you going to do with me? "
"Nothing much. You will be sent to the Realm of the Dead along with Georg and Leonardo. Hades is really unpleasant right now, so you guys can cheer him up. You can wait for the spider's web to come down there. But I will be taking all of your Longinus'. Oh yeah, it sounds like Vlad and Gille are dead, and Heracles was arrested. Anyway, for me to take it from you guys in the Balance Breaker state... it sure makes me happy that tears will be flowing out from my eyes –ZE!"
Cao Cao chuckled as Indra took their Sacred Gears. "...You sure are a horrible God, you know?"
Indra made a dirty smirk, talking as if he was innocent. "Who were the ones who were trying to control me and the other Gods from the shadows, obviously that's what I'll tell everyone. You used me, and I'm innocent, right? Well, you just basically received your punishment for it. –I will give your holy spear back to you if you can come back from the Realm of the Dead. Since you are a Hero you should be able do such things. After all the Sekiryuutei did do something similar you know? Anyways, see ya around, Hero."
Unknown location
A fiery red magic circle that had literal fire on it appeared in the center of a dim lit room that appeared to be colossal in size.
From it, came Gin, the girl with shoulder length blue hair and the other girl that wore a mysterious red mask.
Gin smiled as he walked out from it and stretched.
"Why are you using that appearance?" The girl with blue hair asked.
"That's simple, because if they knew what I looked like, then I wouldn't be able to spy on them." Gin said as a golden magic circle surrounded him.
FLASH!
As the golden light settled down, it showed his true appearance, as he made a sly smile. Stretching again, a tall and dignified type of personality could be inferred. Handsome, eyes crimson like blood that had slit pupils, and golden hair gave him a different vibe from others. A true child of a God.
He wore an expensive looking black leather jacket that had white lines in it and fur, along with black leather pants and boots. Underneath his jacket was a casual white button-up shirt, leaving the first 3 buttons undone.
Gin hummed as he thought, then proceed to walk into their teleportation circle. "I'll go get our final member. I guess I'll be back later."
Tartarus
"So Order... a Primordial Entity who has no virtual limit... is a female?" Shemhazai asked while scratching his head.
At this point, Vali, his team, and Kaii's team had been taken to hospitals in the Underworld for treatment, while Kaii, Order, Shinji, Ajuka, Shemhazai and Ajuka searched the pit for anything left behind by the Demons. Michael had returned to Heaven to report his findings, and most likely to prepare for the worst, a war.
"So that man with the blue hair that came here earlier was a Zodiac?" Kaii asked.
"Yes. The Zodiacs are humans that were personally trained by God of the Bible prior to his death, and also prior to the Sacred Gears being created. For that reason they are almost transcendentally powerful, and have unlimited life spans. If a Zodiac happens to die in battle, a new one is selected and trained. The one who granted them the power to make another Zodiac was Shinji-kun's father, Balthazar." Shemhazai explained.
Shinji sighed hearing that name. "My old man kicked the bucket a long time ago Kaii-kun, I just never said anything, considering your situation with your father."
"It's fine, I'm more interested in hearing about these Zodiacs."
"-Continuing, they are known as the Zodiac Twelve, and are humans that are much stronger than myself. The titles of each are passed down when new ones are chosen. The Ox, the Tiger, the Rabbit, the Dragon, the Snake, the Horse, the Sheep, the Monkey, the Chicken, the Dog, the Boar and the Rat. They're sort of a last resort task force that comes when the situation is nearly disastrous. Although, there's always a leader that does not represent one of them, and something akin to a supervisor that watches over them and keeps them in check." Shemhazai said.
"So the man who came down here was the leader?" Kaii asked.
"Correct. -But Kaii-kun, this is what's important about this topic: After digging around, I found out that your father was once one of them. He originally was the Rat, and following the "incident" 12 years ago, he disappeared, and they were forced to find a replacement. Also, his father Hael, is the current supervisor for the Zodiacs."
Kaii shrugged, not really caring. "Oh well. Lately I haven't cared too much about the past much anymore."
Shemhazai looked at Kaii with a serious face and spoke. "I hate to talk about this, but you realize that you likely aren't related to him by blood, correct? He is a human, and your mother was a Devil."
"Continue."
"That would also stand to reason that this may be the same case for your older brother, meaning that your biological father is out there somewhere."
"I don't care-"
Kaii was abruptly cut off as the entire pit started vibrating, throwing them off their balance.
"Hmm, thank you." Order said as she was touching the wall.
"What the hell was that?!" Shinji screamed.
Order tilted her head, not understanding for a second then finally understanding. "Oh, well Tartarus is a Primordial Entity itself. I was just asking him what he saw, and apparently about 150 years ago the Lucifer came here and undid the sealing on the pit, and let the Demons out."
Shemhazai clicked his tongue and made an annoyed face. "I should have known Rizevim would be the one behind this."
"Anyways, I'll be going for a little while, Thesis is calling us for some sort of meeting." Order said.
"Thesis?" Kaii asked.
"S-Sorry, I tend to forget to explain things. She's the Primordial Entity of creation."
Everyone nodded their head, still a little shaky on the whole Primordial Entities and such.
Order softly narrowed her eyes as she looked at Kaii. 'I just hope it doesn't wake up while I'm gone.'
She quickly ran over and hugged Kaii, but also whispered something into his ear, making him widen his eyes and nod his head.
"O-Oh, before I go, you are Balthazar's son, correct?"
"Yeah, why?" Shinji asked.
"He meant to give you this before he died. When the human came down here I remembered. Here you go." She said as she tapped his forehead.
The wind slightly picked up around him, as his wings disappeared, and were replaced but 2 large golden wings.
"This is..."
"The power of a Seraph. It's up to you how you use it." Order said as she gave her farewell and vanished.
Shinji scratched his head and sighed. "...She didn't even bother to tell me how to activate it."
"Well there's nothing here, so let's go everyone." Ajuka said, as everyone flew upwards.
However, unbeknownst to them, someone who had avoided detection was leaning up against a wall opposite of where they were.
It appeared to be some woman in a full body black cloak and hood, only exposing her mouth, who was flashing a grin.
"I heard exactly what you said Order. So then that's all I have to do... huh?"
Asgard
It's been about 2 months since Loki was defeated by Kaii and his friends, and as such he was placed in a maximum security prison, with absolutely no way out from it. It was placed high in a tower, and in the room a large white cube, which he sat in, with no doors and anti-magic armaments all over it.
Loki looked pathetic for a god, wearing casual clothes, slouched up against the wall with longer hair than he normally had.
He turned his head and noticed someone familiar walking over to his "cage", and made a sarcastic smile.
"How pathetic." Gin said as he walked out from the shadow, with crossed arms.
"...Now what do I owe the pleasure to?"
"I do recall you saying back then that you would help me with my plans after I helped you with yours? Well, it's time for you to hold up your end of the bargain." Gin said was he planted his hand on the cube-shaped prison.
Loki chuckled as he stood and stared him right in the eye. "Your plan involves them, right?"
Gin nodded his head in response.
"Then count me out. You must be working with Tenma and his good-for-nothing Demons. It's not the right approach to defeat them."
Gin's bangs covered his eyes as he made a cocky smile. "...I see. Well, Evil God Loki, I hope you rot in this prison for the rest of eternity."
Loki went to sit back down and crossed his arms behind his head as if he was relaxing. "Don't be angry, son of Izanagi. You'll see in the end. People like him always win."
Gin made a fierce expression as he walked away. "I guess we will see."
The Underworld
Kaii was walking with Azazel and Sirzechs who had recovered from their fight with Hyskoa, down a path outside of the Gremory Mansion, explaining what had happened.
Sirzechs had a serious face as he spoke. "Are you absolutely sure that was Rizevim?"
"Yeah, why?"
Sirzechs pinched the bridge of his nose as he sighed. "Rizevim Livan Lucifer is the son of the original Lucifer and one of the three known Super Devils. He was allied along with Katerea, Creuserey and Shalba back in the civil war, in the Old Maou Faction. However they had a disadvantage against us because there was only one of him, but two Super Devils on our side, Ajuka and myself. However, late in the war, he went into hiding and never came out, leading to our victory."
"So this is the first news about you've heard about him since all the way back then?"
"Yes, however I had a feeling something akin to this would happen, so my entire peerage was meant to be something like an "Anti-Rizevim squad"." Sirzechs explained.
"You see, Rizevim has something that no one else does, and that is the ability to cancel Sacred Gears completely. So for that reason, Sirzechs' entire peerage is formed out of monstrously strong people without Sacred Gears." Azazel chimed in. "But what worries me is the Evil Dragon part..."
"What should we do?" Kaii asked.
"I'm going to go talk with some leaders, in the meantime you all should just start training for when the Qlippoth strikes again."
Hyoudou Residence
And thus, a few days later, everyone including Alice, Kuroka, Le Fay and Merlin came to the Hyoudou Residence, in the living room. Although, Kuroka and Le Fay were (per Vali's orders) to begin living at the place. Shinji was the only one absent for unknown reasons.
After confirming everyone was there, Rias and Kaii stood up to explain what would happen next. Getting a pact with a Magician.
"Ravel, Le Fay, Merlin and I can help you pick one, Ise. I've already picked mine a few years back." Kaii explained.
"Him?" Issei asked while pointing at Merlin, who tilted his head oddly.
"Yeah. Magicians are people who have dedicated their life to the sole purpose of magic, and for that reason can be very powerful."
The explanation would continue for a while, as everyone returned to a pretty happy life.
Unfortunately... they were not aware of what was coming-
...Far into the realms of nothingness and creation, a place beyond human comprehension existed above the infinite number of worlds in creation. With power beyond comprehension, Primordial Entities could call this place a home.
Currently Order and the multiple other entities were discussing an urgent matter. Not only in our world were the Demons attempting to cause an apocalypse, in the neighboring world, something even worse had come to light.
In this realm, Order and the other entities had banished their "appearance", and became nothingness. Just an existence.
"...I see. So that world has already met its end." Thesis, one of the Primordial Entities commented.
"And and one will be next unless we do something... we have to change the "King" system of the worlds."
As Thesis was about to respond, all the entities jumped when they heard laughing from all around them.
"Hahahahaha! Very interesting! So the entities get together in order to stop the "King" that escaped!" A man's voice said.
The place "beyond comprehension" appeared to be deep space, so this man appeared to be walking on stars and planets as he continued to laugh. But... something wasn't right about this "man".
He was wearing a black cape and hood, that had a wide collar and a strange looking black armor with bone-like protrusions sticking out of it underneath. In one hand a tiny floating crystal was there, relaying everything in the Hyoudou Residence. The hand was pitch black and looked like a monsters hand as it had very long and sharp fingers. Underneath the hood was a face that was... familiar?
"I'm sure you all know who I am." He cooed.
Order noticed him watching Kaii and his friends and immediately realized something. "It can't be... you're after her?!"
At that moment, the man snapped his fingers in his other hand, and thousands of sealing barriers surrounded all the Primordial Entities.
"I'll let you all out in a few months, once my plan is done there." He said as his smile disappeared, watching Kaii.
Ignoring the entities who were trapped he walked away, and thought as he looked at Kaii. 'Without Order, you will awaken, Kouhai.'
He turned back around to the entities and put his hand forward, forming a familiar spell.
"Is that...?" Thesis began.
"The power that crushes everything in its path, bringing every existence to nothingness." The man said.
As his crystal zoomed in on Pandora, his smile grew wider.
He, or rather-
-It, made its way to Purgatory.