Hello, I'm making a new story that where the CoD zombie crew x with the highschool dxd. With the help of the devil, they can end all of the madness of the corrupted reality.

Disclaimer: I do not own call of duty and Highschool dxd

In Morg City the Four sinful character defeated the shadow man, with that the apothicon guardian descend down with the summon key, but with the slightest grab came from that appears to be Richtofen whose snatch the summon key from them.

"I'm so sorry, I don't really have to explain. I have a universe to set right, thank you und goodbye."

With out of haste he left toward the portal and teleport back to the other three. Leaving the the four to there fate and death against the undead horde.

Meanwhile in the Occult Research Group

Rias had a "summoning the devil order" so she decided to send Issei and Asia.

"Hey, Issei and Asia?" she smile toward them.

"Yes?" they both replied.

"I need you two of you to be my messenger." she gave them the request.

So they accepted the offer and so Akeno Activated the circle teleportation and they step in the in red circle it brighten up the room until something phenominal occurred.

"The F-" Issei was about to cursed but instead Richtofen fell on top of him.

Issei and Richtofen looked at each other, they begin to freaked out and panick, seeing a man with blood cover with his attire, a saw, all other medical equipment on his belt, also carrying a blood vial

"Who the hell are you?" he yell with confusion

"Where am I?! What is this place?!...and When am I?!" Richtofen trying to figure out what the possiblities of how he enter this dimension.

"Your in japan, at the Ouccult Research Group, and the year is 2015." Rias gave him a happyful smile and showing no surprise expression.

"I needed to go back, there is no time for me to be here." Richtofen acted in a hurry to return to his timeline.

Rias sense a disturbence in the room as he had something much darker that is consealed. Her expression changed so she decide to talk to this unknown traveler.

"You have something much worse that your carrying?" Rias question the Doctor

"That is does not concern of you." Richtofen rather keep this to a mininuim.

"Then shall I see it?" She approach to see what he has in his pocket.

"No, I have much business to attend too." Richtofen hold the summoning key that is in his pocket.

"Then we should take it by force." Rias signal akeno to retrieve from him.

"That will be not necessary." He grab Issei and pointed the pistol against his nuggen.

So basically you can say is, mexican stand-off perhaps. As in the position of checkmate, Richtofen demanded them to make a teleported circle.

"Make a portal for me to return my original timeline, and then I give back your servant." Richtofen bargained with the devil.

She ask akeno to do it and so she activated, Richtofen push Issei towards the ground cause him to make a little grunted.

"Thank you und goodbye." Richtofen was very pleased with there cooperation, so he teleported back to the giant.

Asia came and help Issei up and they all confused and curious of who was this strange traveler was.

"Why did we let him go? we could of stop him." Issei was whining of why no one tried to save him.

Rias was curious and so of that, it would be best to have a adventure, and follow this unknown person.

"Akeno." Rias Ask to come up

"Yes, Rias?" She replied

"Get Koneko and Yuuta, going to follow that mysterious person and see what he's planning.

"The Giant" known as "Der Riese"

At the factory there was a power switch was sparking. The dog kennel was completeing empty. A symbol Group 935 on the wall.

"Edward! What are you doing? Open this door! Edward, open this door now!" Dr. Maxis demanded Richtofen 2.0 to open the teleporter door. Samantha started crying.

"Stay by me Samantha!" Maxis hugged his daughter and prepared for the worsed.

"Goodbye, Doctor Maxis." Richtofen activate the teleportation and causing the time to stop on the clock.

Giving out a sinister laugh, a gun click behind him, as he turn came a young soldier, by the name of Tank Dempsey.

"this is not funny Doc." Dempsey was pointing the the barrel of the pistol towards Richtofen 2.0.

"Turn around." Nikolai pump his shotgun.

"Slowly" Takeo came into the picture.

"Do you know? WHO I AM!?" Richtofen 2.0 try to intimidate his victim.

"Yes, we know. That's why you better do exactly what we say." Dempsey confronts him

"A great evil approach. There's a chain of event that must be set in motion." He along with Dempsey too try to confront.

A zombie cried out so they played there part.

"A future hangs by a thread. you must awaken the test subject." Takeo confronts too

Nikolai is at the window waiting for the horde of zombie to come. Dempsey loads his duel-wield pistol. Takeo took his katana and seeing the teleporter acting up itself. A zombie came pulling out the board, giving out a threatening cry, Nikolai shoot his head. Dempsey was on a killing spree until he heard a panel made a sound.

"Richtofen, whatever you thinking your doing, don't do it!" Dempsey warning to not open.

"You do not want to meet whats on the other side of that door." Nikolai try to convince him.

"You cannot begin to comprehend what evil you could unleash." Takeo told him about the consequence.

As the careless Richtofen 2.0 push the panel button, the door slide opens with amist in the air showing a silhoutte figure in the teleportation. The figure approach to Richtofen 2.0 and it reveals to be Richtofen 1.0, as with the grin oh his face, he gave him greeting for successful experiment. But it turns out, the other Richtofen wasn't there for his work, but put a bullet through his head.

"Dammit Richtofen I thought were done with this." Dempsey was frustuarted.

"What can I say Dempsey, things changes." Richtofen had a change of plans.

"Only a fool can change history." Nikolai knows between right and wrong, but could cause some bad karma

"I am no fool. What I do, I do only to secure a better tomorrow." Richtofen explain to him that he knows what he's doing.

"Yea, let see if we live to see it." Dempsey has doubt that they may not live through this.

They jump down and killed through horde of zombies.

By the teleporter in front of the Pack-of-Punch

The Group of devil teleported on the platform and look around, saw the logo on the top of the building..."Der Riese".

"W-Where are we?" Asia was bit scared because this place reminded her of a scary movie

"Hmm...I not foreign with this word? Rias can you translate that?" Akeno was curious asking to her friends

"It said The Giant. But why the call a giant if there no giant?" Rias was at a lost and don't understand what it stand for.

"I-I think...I know why that call it the giant?" Issei pointed the Robot head hanging on the crane. A zombie cries sounded close by and some gunshot in the distance.

"I have feeling that were not alone." Koneko was cautious of what was going on around here.

"I'll scout ahead to see whats the noise coming from." Yuuto ask Rias permission.

She nodded as he left to see what's happen.

Back to the zombie crew

"Richtofen explain yourself why kill youself." Dempsey needed a answer of why he do it.

"That was not me, it someone else. But he gone now." Richtofen explain of how this reality corrupted all their own version, after he was done explaining. they all huddle up and whisper to each other that they don't trust Richtofen. Yuuto was watching them from above as they chat at the bottom by power box.

"Now we must activate the teleporter. Dempsey, you will go to the boiler room. Nikolai, head to the factory and you'll find the teleporter that is obvious. Takeo, head to the incinerator room. And I will activate all of them at the receiver. I will be there waiting."

They all went in their own way turn on the teleporter. Dempsey went and turn on his and Richtofen activated it. Takeo activate his and it became activate for teleportation. Nikolai activate his and when that was done they all return to pack-a-punch. They saw Richtofen standing at the bottom at the stair looking up.

"Hey, Richtofen? What are you doing looking up for?" Dempsey was confused of whats going on

"Comrade Dempsey, it appears we have a problem with little children with school uniform." Nikolai was being sarcastic of seeing the Occult Research Group.

They all a bit surprise of who and what the hell are they doing here.

"So? you decide to follow me, Ja?" Richtofen being Mister Funny guy.

"I'm still curious what you have there." Rias saw the summoning key in Richtofen hands.

"May I look at it?" Rias begins with her approach towards Richtofen.

Nikolai cocked his shotgun and he begin to aim. Takeo pull out his Katana and wield against his opponent with another sword. Dempsey was pointing Dingo towards to the other devil.

Between with curiousity of Rias trying to see what the origin crew, a zombie cry shouted in the distance, so there another time to seek the truth.

They begin by watching all barrier to make sure no zombie are gonna cross over. Issei activate his sacred gear and begins his fighting pose, Akeno activate her holy lighting to smite the zombie, Koneko begins melee attacking through the horde, Yuuto decapitate all zombie main body parts, Rias was observing her team. When the onslaught slow down , Richtofen went to the right side of the Pack-a-punch, there a fly trap and activated ritual to free Maxis.

"Wanna play a game, let's play game of hide-n-seek. Those were her exact words." His voice was demonic.

As the Occult Research Group was amaze by this pheonomial voice, Richtofen went to the incinerator room and found another toy of samantha.

"Hey, you found one. I can hear her, even now." He was so depress of the lost of his daughter.

Asia felt sorry for the old man whose cover by his own guilt, losing someone cared the most.

"Wow, you found another one, there must be a purpose to this?"

It seem to be working, that Maxis is slowly recovering his memory and continuing the next step.

"I see it, the Aether is lit. I know where and when you are! sooner or later I will find you, together, we will ensure the better future for the children." Maxis made a print and manual for the robot, so they can head to Der Esindrache.

They Richtofen and the other three were about to enter until Rias stop them.

"Hey?" Rias shouted

They all turn around

"We would like to join with you, it look like you made need help with your journey." She was so cheerful

"Nikolai agree with big boob lady." Nikolai with his sarcasm.

"With more allies, much stronger we will be." Takeo being wise with his word.

"I don't know, the kid in back whines alot, not much of babysitter." Dempsey compliment about the issei kid.

"We main complete our mission, but they know they are walking in a dark path." Richtofen was unsure but hey, the more, the merrier.

"You may come, but may have to do what we say. no mistakes." Richtofen explain there deal of they have to do. They begin a process of making the robot.

To be continue...