Author's note: This will serves as a preview for now. Let me know if Ichigo should have a harem in this story or not.
Disclaimer: I do not own Bleach or High School DxD
Prologue
The sky is dark, cloudy, and currently raining upon a battlefield that is littered with corpses of humanoid beings, most with wings on their backs and different outfits in comparison to those without them that wear white uniform with a mask and beret on each of them. The humanoids with wings either have pure white, bird-like wings or black ones as some have black leathery wings. They are the Angels, Fallen Angels, and Devils who have recently agreed to a true truce and peace after a meeting between the leaders of all the Three Factions have gone well.
The soldiers are wearing the white uniforms, berets, and masks to cover their face are the Quincy Soldats, the foot soldiers of the Quincy Empire. Their appearance gives them the impression of a frightening unified army that is more ready to fight an all-out battle. This faction is called the Vandenreich, the Invisible Empire who recently declared war on the Three Factions a while ago.
The current battle that is going is faring terrible for the Three Factions as they have been caught in a surprise invasion by a handful of individuals of the Vandenreich. These certain individuals were known as the Sternritters or Star Knights who were given the roles of weakening the commanding staff of the Three Factions at the site before unleashing hundreds and hundreds of Soldats to wipe out the remaining soldiers of the enemy army. The army of the Three Faction is struggling to put up resistance against the invaders who aren't letting up on their assault.
On a location somewhere far from where the foot soldiers are currently fighting it out, four beings stood before a single person. These four people are Michael, leader of the Angels and Seraph; next is Azazel, current Governor General of the Fallen Angels; and last is Sirzechs Lucifer and Serafall Leviathan of the Four Great Satans who are the leaders of the Devils. They are now holding their ground against this one man who is more than brave enough to attack the Three Factions all together.
The man has a long black hair that reached his mid-back and has a mustache that goes across his face a little. He has the appearance of a powerful man in his forties whose eyes showed no fear, but only disinterest. He wears a customized white uniform of the Vandenreich with a black cloak that has ragged edges and held together by a button with the symbol of the Vandenreich on it which is a five-pointed cross. This man is Yhwach, the Emperor of the Quincy Empire and the one who is feared by even the God of the Bible and the original Satan themselves a thousand years ago.
Yhwach currently has his spirit weapon out that resembled a Chinese Dadao and has a cross-guard shaped like a bird. He holds his weapon calmly to his side while staring impassively at the group in front of him. The gathered leaders of the Three Factions are short of breath as all their efforts of even landing a scratch on him have been in vain.
"Will you continue this foolishness and die fighting or come to your senses and surrender?" Yhwach asked them calmly.
"No, as if I'd surrender to a cold-hearted bastard like you." Sirzechs stated as he paused for a second. "You declared war on us out of nowhere by forcing one of my people to deliver the message after spilling some blood along the way. Then, when you finally attacked, you sent your soldiers who even hurt civilians who weren't part of the conflict in the first place." He finished with hatred in his voice.
"What is the purpose of this? Is this revenge for what happened to you and your people over a thousand years ago?" Michael questioned.
"No." Yhwach replied simply, surprising them.
"Then why? Why did you cause all this much destruction in the first place?" Serafall demanded in her most serious voice.
"I did this because it must be done. This is all in the name of true peace." Ywach replied again.
"Peace? Bullshit, we were doing just fine before you came along and started a war." Azazel retorted.
"You said that as if you were actually close to obtaining peace yourselves. Let me tell you this, that's not true at all. There will always be tension between Angels, Fallen Angels, and Devils as there is always be tensions between humans of different nations." Yhwach countered.
"There may have been bad blood in the past, but the future is always something new that we can grasp on for a better future. People will learn to get along with each other eventually; all we need to do is persevere in that direction. What you did today will only set everyone back into an age of wars." Michael said with a stern look.
"Hahaha, you say that aim for peace between the Three Factions huh? This is why you are all weak and haven't even managed to injure me in the slightest. The Three Factions were actually much more fearsome in battles over a thousand years ago, that even I respected them for that. Now, you have all grown soft." Yhwach scoffed as he dismissed his reishi sword and stretched a finger while gathering energy and aimed at Angel, Fallen Angel, and Devils.
Sirzechs knew he was about to attack. "Shit! Everybody get out of the way!" He warned his comrades of the incoming attack.
Yhwach blasted spiritual arrows that were shaped like a Quincy cross from his fingers at the spot they were just a second ago. The resulting explosions of the blasts blew them a distance away. "I have grown tired of this game. I will finish you all here right now and proceed to take what I came for here in the Underworld." Yhwach stated as he was just about to send another barrage of holy arrows at his enemies until a loud explosion erupted in the sky.
This caught the attention of everyone on the battlefield fighting as they stopped fighting for a second as they suddenly felt a powerful presence came from the spot of the explosion. For the present leaders of the Three Factions, they were confused by a familiar feeling of this unexpected presence that yet seemed so much different for some reason.
For Yhwach, he was actually frightened and surprised at an unexpected occurrence. The power in the explosion was unsettling as he had no idea of what the source actually is. He immediately right away tried to sense this new presence and identify it, what he found shocked him even further. 'It can't be... this reiatsu feels like his but different. I killed him myself! He is supposed to be dead!' Yhwach thought alarmedly to himself.