A long time ago in feudal Japan, a family was dying from a disease, the only one who was well was the father of this family.
He tried to look for a cure but couldn't.
Until he received an offer to become an Akuma or Demon for us.
With no one else, he accepted and became a bishop for the devil.
After a while he discovered he had a sacred gear.
He had a Sacred gear mid-level independent Avatar-type, appearance of the Sacred Gear there were two gloves that covered her entire forearms, gloves were red, She had yellow accents on the sides of her forearms formed from a wave of fire, there was a silver part on the wrists that covered the back of the hands It had five holes.
His Sacred Gear gave him very basic control over fire, allowing him to cover his fists with fire and launch fireballs with a certain size limit.
His Sacred Gear's independent avatar was a Wyvern. Almost literally the size of a fairy with wings mixed with his arms and no legs, he was nicknamed Kaiser.
He wasn't very strong, in fact he was too weak by normal adult demon standards.
He had received the bishop's piece and he was considered weaker.
But as everyone knows, the world doesn't spin, it capsizes.
Weaker Bishop, he trained harder, to level up the Sacred Gear and reach the level of a Demon King.
He worked hard, reaching a level that a reincarnated demon never reached before, he reached the level of a pure-blooded devil, there was a giant inequality between pure-blooded and reincarnated devils, but he made it against the will of many, he managed to become a Demon Noble and got him a territory.
But he didn't take any territory, skin took the poorest terrible and was going to improve that territory.
It took a while but he did it, he managed to transform a poor territory poor falling apart into a developing territory. Through his inventions that helped a lot to improve the quality of life.
He had the evil pieces, but he didn't have many members, he had his maid who worked for him but wasn't part of his nobility, he had done a test to see if he qualified to enter his noble but that's where he got his rook/queen.
Noelle coming from a poor family, she trained a lot to be the queen of his noble but unfortunately she stayed as a rook but her training generated unique results for a rook.
It became known as the tower with the power of a queen.
His master married a pure-blooded demon woman and they had a daughter, a little bit of human genes that gave her a Sacred Gear but no she wasn't born with a Sacred gear.
After a while, one thing affected this demon's life, so he would take some time away from his family to cool off, the only one who would have contact with him would be his tower.
But the question remains where he would go.
He discovered that Kuoh's territory was without a general supervisor so that's where he would go.
" Keep the barrier up! " Sona shouted aloud to his nobility to keep the barrier, but unfortunately she knew they wouldn't last long, they needed so much more time.
Saji was dying, his energy was running out, he should have been at the limit, not counting the others who still had a little more energy.
" Open the barrier " A voice came from the spot.
Sona widened her eyes and turned her head to see for herself why she believes her ears were playing a trick on her, when seeing the newly arrived and confirmed, that was the person she was thinking.
" Guys open through the barrier " Sona ordered her nobility to open the barrier.
All members of Sona's nobility were confused by the order, they looked back and saw a figure.
Rias Gremory's Nobility was hanging by a thread, your tower was on the ground bleeding in heaps, your knight was fighting tooth and nail, your bishop was weak from so much healing.
While she and her queen, they're on the front line getting beaten up like a bitch so they can face Kokabiel.
But then he made a revelation after Kiba, Rias Gremory's knight reached his Balance Breaker, Kiba was a demon but he made his Balance Breaker a Demon holy sword which should not happen due to the opposite natures.
Then the cursed priest came to a conclusion, which has already been discussed several times.
But before the wretched priest could open his mouth he was stuffed by a spear of light.
Then with sadistic smile he spoke.
" In the great war, not only the Demon Kings but also God— " Kokabiel was all excited but he interrupted because he got punched in the face.
Everyone was surprised to see Kokabiel being played against academy.
" You've already said too much Kokabiel " An unknown voice that was responsible for attacking Kokabiel.
Everyone looked up, the exorcists from the dying church also looked up. A demon head covered the back of its neck and its eyes were brown, he wore a red shirt and jeans, white sneakers with blue and red details.
But what stood out about him was that he had a set of five pairs of demon wings.
And there was a Wyvern that was on his left shoulder, this Wyvern was red but it had no legs just a tail, its hands were next to its wings, his eyes were green.
" Issei Agnimon! " Rias screaming in surprise to see him.
Kiba and Akeno were speechless when they saw that demon, Asia wasn't understanding anything just like the exorcists.
" Kokabiel, for attempting to recreate the great war and for threatening the human race you are condemned to death " Issei Agnimon said it loudly, he said it as if he was an authority of great importance.
Kokabiel came out of the wreckage of the academy.
Issei looking at the fallen angel, he raised both his arms and they caught fire and quickly the flames dried up and gloves appeared, his wings shrank so he fell.
When he fell to the ground at the exact moment his parents touched the ground, a powerful tornado of flames erupted in the place, the flames dissipated.
From those flames the Demon named Issei Agnimon was wearing armor. His armor made it look like he had his layers of protection down and it looked like he had a black body suit that covered his entire body. On the breastplate there was a white protection, Her legs and thighs had protection red in color with a line that looked like flames on the sides of its legs and the edges were yellow in color.
His boots had two claws and the top of the boots had a small gray part that had three holes that formed a triangle.
He had protection on his thighs that was separate from part of his legs, his waist had two belts that came together and made an X that met at the front.
On his shoulders he had double shoulder guards, the first protection had three holes that also formed a pyramid and the second protection a black horn.
His helmet was different, usually Balance Breaker helmets were closed, few had their mouths showing.
His three-horned helmet, two on each side of the L-shaped head and both had two red lines at the base of the horn, the third horn was on the forehead but it was smaller and the tip of it was red in color, the helmet overlooked very long blond hair that covered most of his back.
Behind a humanoid figure mixed with a dragon appeared, he was two meters and a little tall, he was wearing red armor but on the knees and elbows there were gray chips, Its head had white colored protection with two horns on each side.
He weapons mounted on his forearms that nothing to hide.
Rias Gremory's nobility felt that power emanated from him, a reincarnated demon who was very close to reaching the Demon King Class or Maou Class.
" Kaiser take care of that exorcist " Issei ordered his friend who just nodded his head. Spreading his wings Kaiser took him away, Issei walked up to the crazy Falling Angel.
Kokabiel smiled, finally something worth fighting.
The mad priest who had incomplete Excalibur was freaked out when he saw a demon awakening a Balance Breaker that shouldn't exist but now he saw a demon that was basically the level of a Cadre.
But what he didn't expect was that dragon that belonged to that demon to appear so fast in front of him.
Freed Sellzen was facing a powerful beast that could kill at any moment.
But he had Excalibur, unconscious but he had a legendary sword.
Then he attacked, Kaiser held the holy sword with one hand and with the other he fired a shot into the false priest's stomach.
One is gone, just one to go.
An explosion of flames happened behind Kaiser who just turned around and did nothing.
Issei and Kokabiel were dueling, sword of light against sword of fire. Both were fighting at high speed but Kokabiel was having a hard time keeping up with him, so when Kokabiel missed an attack with his two swords trying to cut Issei in two.
But at that time Issei let his swords fall and dodged to the side, clenching his fists that started to catch fire and quickly changed color to blue. Fire swords exploded.
Kokabiel was caught in the explosion and didn't have time to think.
Issei's fists that were covered in blue flames touched Kokabiel's chest who just felt his body being burned. Kokabiel's body was taken by blue flames burning everything in his being, even his soul.
Mission complete.
Issei started absolving the flames not leaving much damage on the spot.
Heaving a sigh, he sat flattering that the thing was over so quickly. He didn't need any more trouble at the moment.
The Bishop of Rias Gremory, Asia Argento was healing his teammates while Issei and Kaiser were approaching them, Rias Gremory quickly stood up.
" Lord Issei Agnimon to whom you owe the honor of your presence " Rias said still very hurt with her clothes quite destroyed, the top part of the clothes was gone, there was nothing.
Issei extended his right hand and a reddish yellow magic circle appeared. The clothes of all of Rias Gremory's nobility members have been repaired.
Kaiser with incomplete Excalibur went to the two exorcists who were badly injured, they were scared to see that dragon in front of them with holy sword in their hands, but they didn't expect that Kaiser would just stick the holy sword in the ground and walk away.
Issei entered a letter for Rias who was scared because it had the symbol of the Demon Kings.
" From now on I am the general supervisor of the Kuoh's Territory, don't worry I won't get involved in your private comings " Issei told Rias that he couldn't believe it, she opened the letter and started reading.
She this letter faster from Hermes to deliver the messages, she the letter where it said that Issei Agnimon was the highest authority and the last word was his, but she and Sona wouldn't lose their independence.
" Well now I'm gone, I take care of the problem " While Rias was in shock staring blankly at the letter, Issei was ready to leave but he noticed that the Kaiser was standing there looking at the sky.
" Won't you come boy? " Issei asked the Kaiser who when he heard Issei's voice he ran to him.
When the two left the barrier fell, why Sona's nobility no longer needed to maintain.
But no one except Kaiser noticed a white armor with wings made of crystal flying in the sky and behind him was the moon.