Y/n:"Isabella, snap out of it!"

*Boom!*

A ploom of dust arose from the monstrous ball of fire Isabella sent. Y/n didn't want to turn in fear of accidentally hurting her. It was only a matter of time before he would be forced to fight back.

Y/n:"Isabella!"

Isabella:"Die!"

*Bang!*

Ignoring his pleas to stop, Isabella threw more explosive magic hitting him directly. Fire consumed his entire body making her think the fight was over.

To her surprise, as the fire died down, Y/n stood tall in the form of the Ghost Rider.

Y/n:"Forgive me but I have to stop you."

The Rider raised his chain overhead and slammed it down in her direction. The ground cracked in every direction from the downward blast with flames bursting.

She dashed backwards to avoid the incoming attack whilst preparing a counter attack of her own.

Y/n:'I just need to restrain her movements.'

Readying his chain for another swing, something unexpected appeared before his eyes.

Nightmare

Nightmare:"Back off Rider. She's ours, we need all we can get to take over this world."

Y/n wasn't here to play any games with him or anyone. The Spirit's only objectives were to find and kill Blackheart while trying to find a way to save Isabella.

Rider:"Go fuck yourself, haha!"

__________

Back in Kuoh city, both Akeno and Suzaku were out for a stroll on a weekend. The two were enjoying themselves when they suddenly were met by Rias and Grayfia.

Akeno:"Rias? Grayfia? What are you two doing out here?"

Rias:"It's Y/n! There's recent news coming out of Osaka revolving around him!"

Grayfia:"Not only that, Blackheart has managed to open a gate from Hell and has been allowing Demons to seep through. Everyone is gathering their forces as we speak to counter his moves."

Suzaku:"If he has already gone that far, it's possible the gate may not even be able to close. Our best chance to fight off a Demon invasion is to encircle the entire city."

Rias:"My brother has ordered for all younger Devils to return to the Underworld for our safety. We're too inexperienced to get involved in this, Akeno I'm here to bring you with us."

Akeno:"What!? But I can't leave Suzaku!"

Grayfia:"You must understand that this may be another Great War that is ahead of us. This may be Blackheart's plot, to take over Earth and turn it into his domain."

Akeno:"B-but!"

Suzaku:"It's okay, Akeno. I have faith in Y/n that he can stop him and the gate."

Akeno couldn't hold back her tears as she closed in for a hug. Suzaku tried fighting back the tears as well but failed. The two gave each other a goodbye hug not knowing if it would be the last time they would see each other.

Rias, Grayfia, and Akeno all stood close to each other allowing the teleportation circle to take them to the Underworld. Suzaku looked at her cousin one final time before she disappeared without a trace.

Suzaku:'Y/n, please be safe.'

She turned around and immediately ran back to her temple. If this was the start of another Great War like Baraqiel described when she was little, then all she could was prepare for the worst.

__________

An hour into the fight...

The fight gained attention from the cities residents given all the Demons appearing out of no where. With Nightmare joining in on the fight, Y/n immediately focused his attention on him. He gave no quarter to the runt that nearly raped his little sister.

The Spirit of Vengeance pounded away at Nightmare leaving burn marks all over the devilish being.

Attacking at such a close range gave Isabella a change to fight. While the Rider was focused on Nightmare, she would dash in and join in on the attack. To her surprise, the Ghost Rider's speed was God-like creating after images of all his moves.

Y/n:'Time to push her back.' He thought.

A burst of flames surrounded him causing Isabella to fall back to safety. The intesity of Hell's flames would certainly harm her as well as any other Demon.

Nightmare wasn't so fortunate as he was wrapped around with the Rider's chain and tossed around like a rag doll.

Yanking him back at tremendous speed, Nightmare was met by a monstrous punch from the Ghost Rider launching him right back.

While mindlessly charging into the fight, inside Isabella's mind was a battle between herself and the Demon inside.

Isabella:"Y/n..."

Demon:"You know you want him dead, after what he did to you. Got you killed during the fight in San Veganza."

Isabella:"B-but that wasn't his fault though, I was dragged into it by them."

Demon:"And I wonder who brought 'them'? Come on, give into that burning desire to kill him."

Demon:"Think about it, he wasn't even concerned for you after your death. All of this talk of 'trying to look for you if he knew you were in Hell' is all lies that he made up."

Isabella:"N-no..."

Demon:"He was born into this world as God's judge, jury, and executioner! He deserves no mercy after killing millions of our kind over the last millenia!"

Isabella:"Stop it!"

Isabella:"I don't view him as no such thing! All I care is for him to be free of this world's debauchery and free from Mephisto's reign! If that means I would have to die for him to reach Blackheart then so be it! You're nothing but a plague inside my mind and body! You're not me!"

On the outside of Isabella's mind, Y/n held Nightmare's burning skull in hand as he just finished up the fight. The old Spirit heard Isabella scream making him turn around and run to her.
(Basically made Nightmare a worthless villian, my bad.)

A dark light had emitted from her body consuming her. Her painful screams were the result of Blackheart retaking her soul after he heard her answer. As the light started to disappear, so did her life source. Y/n managed to catch her in time before she fell to the ground.

Y/n:"Not again, not again! Isabella, stay with me now! Stay with me, damn it!" He yelled out to her as he reverted back.

Blackheart:"A shame I had to do that but after my little chat inside her head, she gave me no choice. She rather die to allow you to get to me, how grand is that!?"

Y/n looked up to find Blackheart a few feet away from him.

Y/n:"You son of a bitch! How could you toy with a woman's life!"

Blackheart:"Ah, Death's own emissary lecturing me about the value of life. That never gets old considering how many you've killed. You were born as a weapon, God's weapon, later my father's. See the irony in that? A weapon lecturing to me about the value of life?"

Y/n:"You didn't need to drag her into all of this! If you wanted me dead then kill me instead!"

Blackheart:"Where's the fun in that? Here's a choice though, join forces with me and help me take over this world as my own. If you do that then I can help you kill Mephisto, releasing you to be a free man. I'll bring her back as an added bonus."

Before any answer was given, Y/n began to cough violently, spitting out blood in the process. It was Mephisto's way of telling him not to betray him as his life was held between his fingers.

Y/n closed his eyes and thought of the good times he's had with Akeno and Suzaku. After he killed his Father during the Great War, he's been confused on who's gave him such a blessing of a family. Looking back down at Isabella's cold, lifeless body, he set her down gently while getting back up.

Y/n:"You're a dead man, Blackheart. I'll kill you and bring her soul back with me. Nothing will stop me from doing so."

Blackheart:"Only one way to find out, Bone head."

Rider:"Guess we will."

__________

Three factions command post
Near the outer part of the city.

Sirzechs:"What's the situation?"

Azazel:"Hell spawn, and thousands of them from the looks of it."

Sirzechs:"What's the latest report on the Spirit?"

Michael:"He's been reported as fighting Blackheart as we speak. His forces have already reached Tokyo as well as the northern parts of the country."

Gabriel:"Will he truly be alright?"

Michael:"I'm sure. Father created him to be the strongest out of all of us."

Gabriel:"But Mephisto..."

Sirzechs:"Why is Gabriel here?"

Michael:"My sister and I are worried over our elder brother's health."

Azazel:"Ole' skull face is one of them, remember?"

Sirzechs:"Ah, my apologies. It's been some time since..."

Gabriel:"We know, since the Great War."

Azazel:"Hopefully this isn't the start of another."

Michael:"With the three of us and our forces working together, I'm sure we are more than plenty to at least hold them off. Zarathos is more than capable of destroying that gate."

Azazel:"That's if he doesn't give out during the battle."

Gabriel:"Stop!"

Azazel:"Gyahaha! I'm sorry, I was joking."

Sirzechs:"Enough, let's get to it before any more harm befalls more humans."

Michael:"Agreed."

Hope y'all enjoy!