History's Strongest Devil Disciple Kenichi

I do not own HSDK or High School DXD

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Kenichi dies while saving Kisara, but he gets brought back to life as a devil by Serafall Leviathan. She has one job for him. What is that job? Rejected by almost everyone he knows, who stays by his side? How does he handle his life being uprooted and thrown into a world he never thought truly existed? (Kenichi,Kisara,Sona)

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AN: Hello readers. This is my fourth fanfiction. I was originally going to do a simple Kisara/Kenichi Pairing, but then I watched High School DXD and I had an influx of great ideas. So, I came up with this story. This will be my first crossover story. I hope everyone enjoys reading it. Just so you know, there isn't going to be much Issei in my story. I actually dislike how perverted his character is. My main focus will be on Kenichi, Sona, and Kisara.

Here is a brief list of things to keep in mind:

This story starts just after where the HSDK Anime ended. So, he will have fought and defeated Odin.

In the High School DXD universe part of it, this takes place pretty close to the beginning of the anime. It is after Sona's group gets Saji, but before he goes for his familiar

*Action*

"Dialogue"

'Inner thoughts'

{Phone/Communication Dialogue}

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Chapter 1

Save Her At All Cost

Late one Wednesday night.

It wasn't a full moon, but it was still shining bright. There wasn't a cloud in the sky. There was a slight eerie chill in the air.

Kisara was walking out of a dimly lit alley.

"Damn. I lost track of time while I was following that cat. I've got to get to class tomorrow too."

A light breeze blows through and she rubs her arms a little bit to brush off the chill.

'I hate to seem like a girl, but I kind of don't want to walk home alone tonight. Something seems really off, and I can't shake it.'

As she walks, she only hears the echoes of her boots.

She tries to think of who she could call that wouldn't make fun of her.

Suddenly, she stops, takes off her hat, and ruffles her hair.

"Argh! I can't believe I am doing this. Some strong woman I am." She says sarcastically to herself.

After putting back on her hat, she pulls out her phone and browses her contact list while she continues to walk.

'No. No. No. No. No. Definitely not. No.' She thinks as she goes through the list of names.

Eventually, she comes across one particular name and it brings a small smile to her face.

"Kenichi. I know that he wouldn't make fun of me for calling him."

She thinks fondly of him for a moment as she reflects on all of her interactions with him.

"He's a funny guy. Certainly not boring. Sometimes he frustrates me, but I kinda like him. Too bad he is so obsessed with Miu."

Then she flails her hands in the air.

"What the hell am I saying. I sound like a lovestruck girl. Besides, he fawns over her all the time."

Another breeze reminds her why she was even looking at his number in the first place. Thinking about him had momentarily made her forget about the earie night.

"I guess I've got no other choice but to call him though."

She nervously hits the send button. After a second, she hears her phone dialing his number.

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Kenichi lets out a hefty sigh.

"All done for the night." He says after closing up one of his books.

He had just finished all of his homework for the following school day.

He pulls out his phone and opens it up to look at the time.

"Wow. It's pretty late. I should get ready for bed."

Just as he says that, his screen lights up and he sees Kisara's name pop up. He looks it puzzled for a brief second.

'Kisara? Why is she calling so late?'

He hits answer on his phone and he puts it up to his ear.

"Hello."

{Hey, Kenichi.} She says from her side of the phone.

A brief pause follows the greetings.

"Is everything okay? It's kind of late."

She lets out a sigh.

{I know it is. I lost track of time.}

"Did you find a cat?"

He obviously couldn't see it, but she was blushing in embarrassment from being found out.

She lets out a small, nervous laugh as well.

{Yeah. I did. He was so cute.}

He lets out a small chuckle.

{Are you making fun of me?}

He waves a hand in the air.

"No. Not at all. I was just amused about how you get when you talk about cats. It's kind of cute."

She blushes again.

'He shouldn't say nice things like that to me.' She thinks to herself.

"So why did you call?" He curiously asks.

{Well . . . um . . . . You promise not to make fun of me?}

"Why would I make fun of you?"

She balls up one of her fist.

{Just promise me, dammit!} She yells through the phone.

After having to back the phone away from her yelling, he brings it back up.

"All right. I promise that I won't make fun of you."

{I'm a little nervous. It's really creepy out tonight for some reason. I sense something is wrong, but I can't put a finger on it. You probably think that I am being silly.}

"I don't think that at all. Where are you at? I could meet you."

She opens her eyes wide.

{You don't have to go to that much trouble for me. Hearing your voice over the phone is good enough.}

"Now you are being silly. You are feeling uncomfortable. I don't mind coming out to walk you home."

Her heart flutters a little bit from hearing him say that, but she keeps her cool.

{Fine.} She simply says to him, and then she tells him where she is at.

He starts to get himself ready.

"I'll stay on the phone until I meet up with you."

{What about your masters?}

"What about them? If they ask me where I am going, then I will just tell them that I am walking a friend home. You seem really nervous. So, I won't tell them who it is."

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While she walks, she suddenly stops and realizes something very important that never crossed her mind. Then she smacks her head with her free hand.

{Is everything okay? What was that sound? It sounded like something being smacked.} He asks out of worry.

"It was nothing. Don't worry."

'Shit. He will see where I live. I can't turn him away now. I will just have to deal with him finding out.'

After a couple minutes of idle chit-chat about their school day, she starts to pass by a small and abandoned warehouse.

She could hear faint cries coming from it. The crying momentarily comes to a stop. She narrows her eyes as she looks at the building a little closer. After another moment she hears the crying again.

"Hey, Kenichi, do you know that abandoned building that's nearby?"

{Are you talking about that warehouse that hasn't been used in years?}

"Yeah."

{What about it?}

"It sounds like there is a little girl crying in there. I will call you right back. I am going to go check it out."

{Wai. . }

His sentence gets cut off as she hangs up her phone.

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Kenichi looks at his phone after she had hung up her phone.

"Shit she should have stayed on the line with me."

He starts running to her location.

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Kisara pulls on the door to the building and finds that it is open.

"This is weird. Shouldn't this be locked?"

She cautiously opens the door and walks inside.

The sounds of the crying can still be heard, but it is hard to pinpoint exactly where it is coming from because it echoes throughout the mostly barren building. There is some piles of rubble and debris in some spots. There seem to be a few small room that come before the main part of the warehouse. It's pretty hard to see around the building, but the light from the moon shines through the few windows that are scattered about. There is also an odd odor in the air that she can't pinpoint.

Just like before, the sound of her boots as she walks along echo throughout the building.

She checks the smaller rooms, but doesn't find the girl.

As soon as she enters the main warehouse, it becomes clear that the girl is in there.

"Hello!"

The crying slightly stifles little bit as she hears sniffling as well.

She looks around the room and still can't seem to see anybody.

"I'm not here to hurt you. Are you okay?"

She starts walking around some more and she seems to be getting closer to where the sound is coming from. It seems to be coming from an extremely dark corner.

"Please don't hurt me. Please, I am just hungry." Comes a little girls voice from the corner.

Kisara crouches down slightly as she gets closer to the corner.

"It's okay. I am not going to hurt you."

"That's good." Kisara hears the girl say.

Then a hulking grey man comes out of the darkness that's the size of Miu's grandfather.

"But. . . " Comes the little girl's voice from the man.

"I am going to eat you." The girls voice changes to a deep and grovely man's voice.

"What the devil?" She hollers out.

"Exactly." He says to her as his fist comes out at her.

Still caught off guard, she raises her arms to defend herself and jump back. His long arm reaches her in mid-air before she can get back enough. The huge fist slams into her and sends her flying back. She lets out a small yelp as she slams against the floor.

Loud footsteps can be heard as he begins walking toward her.

'Shit.'

She thinks as she sees him coming toward her.

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Kenichi stops and pants a few times as he reaches the building.

"This is the building that she was talking about." He says aloud.

Sounds of a fight going on are coming from the building.

"What is going on in there? I hope that she is alright."

He was about to take a step toward the building.

"I don't recommend that you do that. You might not live through what's in there." Comes a man's voice from behind Kenichi.

Kenichi nearly jumps out of his skin in surprise. He turns head toward the voice.

There is a man with dual colored hair standing before him. The front part is blond and the rest of it is black. He also has small goatee. The man is also wearing a brown trench coat over a nice collared shirt that is purple with a pair of black pants to go with it. In his hand is a Fruit Of Grisaia video game.

"And, who are you?"

The man waves his hand to dismiss the question.

"That doesn't really matter."

Then, they both hear a scream come from the building.

"Shit. I think that was Kisara."

He begins to take off.

"Didn't I just tell you that you shouldn't go in there?" He says to Kenichi.

"My friend is in there."

As he runs, the man notices a strong power emanating from Kenichi as he runs to save his friend.

The man pulls out his phone and dials a number.

The woman on the other side answers.

"Hello. Serafall, this is Azazel. There is something interesting that I need to inform you of."

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Inside of the building.

Kisara is managing to stand. She has some blood dripping from her mouth and she looks pretty banged up from taking many hits from the grey skinned man before her.

After wiping some blood from his own mouth, the man stands up and looks at her menacingly.

"I think that I've had enough playing around with you. You are becoming troublesome, especially after that last kick you gave me."

"I don't know what you are, but you aren't going to get away with this."

'Kenichi, where are you?'

He starts walking toward her again.

She jumps into the air and flips around. As she makes a forward spin, she brings her foot down at his head.

He reaches out and grabs her foot. The action still hurts his hand, but he continues through it and wraps his hand around her ankle.

'Oh, crap.'

"Let me go!" She screams at him in fear.

Even while dangling upside down, she brings her other foot around and kicks his side. He cringes from the hit and gets a pissed off look on his face. So, he takes her and swings her around and slams her into a wall. She lets out a loud scream from the pain. He turns the other direction and swing her toward the other side of him. Again, she slams against the wall. Her body goes limp.

After ripping her clothes off, He lifts her up and is holding her by her upper arms.

Her head flops around as she fights to keep consciousness.

As he stares at her hungrily, cracking and gushing sounds come from his jaw. It unhinges and begins growing into an enormous size. It grows so big that it looks like he could start to fit her inside of his gigantic mouth.

Her eyes open just enough to see down his throat.

Kenichi rushes inside and comes just in time to see this.

'What the hell!' He thinks in confusion.

He shakes his head.

'There's no time to think about what's going on.'

He charges at the hulking man and does a jump kick at him.

"Let her go!" He screams at the monstrous figure.

The action causes the rogue devil to drop Kisara to the floor and it knocks against the wall. Kenichi drops to the floor as well.

He quickly rushes over to her naked body. A light blush forms on his cheeks from seeing her naked. He could tell that she was breathing. He takes off his button up shirt and quickly tries to put it on her.

"Hang in there Kisara."

The Rogue devil begins to get up. It's jaw shifts back to normal.

"That was pretty daring of you, boy. I will make sure to eat you too, especially after you interrupted my dinner."

'What is this thing?'

He looks back at a motionless Kisara, and then he looks back at the monster before him.

"You aren't going to touch her you bastard."

"I think we have a difference of opinion."

It starts moving toward Kenichi.

'I don't know who or what that thing is, but I can't let him get near her. I have to protect Kisara.'

Kenichi begins setting up his seikuken.

At first, it seems like he does pretty good at deflecting the punches that the rogue devil is throwing at him, but then thing start to change.

Getting angrier after every blow, the rogue devil starts swinging harder and harder. Even with just deflecting the blows, his arms begin to hurt.

After another moment of this, cracking and squishing sounds can be heard from the monster again. This time, two more arms pop out of his sides. Kenichi watches this in horror, but he tries to continue his seikuken.

Now, the monster sends punches at him from all four arms. Many of the punches get through his barrier and sends him flying back a few steps.

The monster deviously smiles at him.

Kenichi's body already aches from all of the punches he has already taken.

Not wanting to let him gain any more ground towards Kisara, Kenichi rushes toward the menacing creature.

It makes several attacks at Kenichi with all of its arms. Kenichi manages to block several of the attacks, but the attack from its upper right arm slams him across his cheek. He gets sent flying a few yards to the side. He crashes and slides across the floor.

It stares at him for a moment to watch for movement. After he sees that there isn't any movement, he starts walking toward Kisara again.

"No." Comes out from Kenichi's mouth.

The devil whips its head toward Kenichi's direction and sees him beginning to get up.

"You pesky kids don't know when to die."

Kenichi walks back over and stands between him and Kisara.

He sends a front kick at the disciple, but he takes a solid stance and he only ends up sliding back a few inches. Right after that, Kenichi rushes him. This causes the devil to get pushed back again.

Kisara's eyes slit open for a few brief seconds again as she sees Kenichi standing between her and the monster.

'Kenichi.'

Then they close again.

Out of sheer annoyance and anger, it latches onto his shoulders with its upper arms. Then it proceeds to bite his shoulder. It bites him extremely hard and even draws blood. At the same time, in a pincer like motion, it shoves the fingers of his other two hands deep into Kenichi's sides. They go in a few inches.

Kenichi screams out in pain, which brings much joy to the rogue devil's ears. He could feel its jaw tightening onto his collar bone and feels it beginning to pull.

'This isn't good. This hurts so much. It going to rip out my collar bone like it was a chicken wing. I have to get out of this.'

He closes his eyes and tries to focus. Then he uses the attack that he came up with that combines punches from all of the martials arts that he has learned into one blow. The swift punch to the thing's abdomen causes it to let him go and it even causes it to cough up some blood. It grabs its stomach from the pain.

Blood starts pouring out from all of Kenichi's wounds, covering him in his own blood. He gets a little light headed, but he shakes his head and then stands defiantly before the rogue devil.

Kenichi brings up his seikuken again as the monster rushes towards him. This time he attacks and defends at the same time. With every block he makes, he makes an attack at the elbow joints of the arms.

The speed of the attacks against Kenichi slow down.

'I never thought that I would do this, but I have no choice. I feel my energy draining out me with every move I make.'

One of the right arms makes its way toward him. He takes his focus off his Seikuken, twists the arm, and then he slams his fist into the joint. This forces it to bend the opposite way and brakes the arm.

It roars in pain and then it slams both of its left fists at his back. He manages to deflect one of them by raising his knee, but he takes the full assault from the other.

Kenichi could feel something break inside of him. He feels a sharp pain as he shifts and attacks the elbow of the lower left arm. Breaking that one too.

It roars again and it shoves him back with its two remaining arms.

The disciple of Ryozanpaku was about to pass out, but he remembers that he has to protect Kisara from that hing.

'Whatever it takes.'

His eyes go blank and his ki is the only thing keeping him up.

"Damn it. You little brat. How can you still be up!"

It starts to charge at him.

Kenichi's body preps for his killer move.

When the devil gets close enough, Kenichi makes a simultaneous attack at the things head and gut. With only having two functioning arms, it brings both of them up instinctively to block the blow to the face. After the blow to the gut hits, it brings its arms back down to cover its gut. It is then, that Kenichi jumps, grabs the back of its head, and knees it in the face.

It gets disorientated from this just enough for Kenichi to throw it off balance with a headbutt to his chest. Its weight gets shifted back as it starts to tumble backwards.

Just like when he fought Thor, one of the eight fists, he uses all of his strength to lift him up and throw him into the wall. The wall breaks after all of the abuse that it had taken. Pieces of the wall fall all around the menacing creature. A metal rod breaks off and slams through one of the creature's eyes.

Kenichi's body collapses onto the ground like the rocks from the wall did.

From the outside, Azazel walks up to the hole in the wall and inspects the situation.

"He caused this to happen?" He says aloud.

A black hole appears in the middle of the ceiling and Serafall Leviathan floats down in her pink and white cosplay magical girl outfit. When she comes down, she looks over the damage, the rogue devil, and the two humans.

"What a mess." She says.

The devil starts to stir.

"We can't let you get back up." She says to the devil.

She swings her wand around in a circle while chanting a spell and then a red circle appears underneath the rogue devil. A shroud of ice blasts at it within the circle violently and then it disappears.

Azazel nods in approval.

"Wouldn't expect anything less from the great Serafall Leviathan."

They look at Kisara and then Kenichi. They see that Kisara seems unconscious, so they turn their attention to Kenichi.

"I can't believe he took that devil on like that." She says to Azazel.

"His aura was something else." Replies Azazel.

He keeps watching from the sidelines.

"I almost didn't call you about this because I was interested in the boy myself, but rogue devils are business for you devils."

Kenichi's eyes were still open, but lacking life.

Kisara's eyes slit back open again and sees Serafall kneeling and looking at Kenichi.

"You are going to die. Is this what you want?" Serafall asks him kindly.

"I . . . want . . . to . . . protect . . . my . . . friends." He instinctively says.

She gages him.

"Really? A rook?" Wow."

She stands back up and holds out the rook piece over him.

Kisara's eyes close again just as she sees his body raise up and brightly glow.

After he finishes glowing, he lowers back onto the ground.

"I will finish taking care of him, but what about the girl?"

"Don't worry. I will make sure that she gets to where she needs to be. I can't wait to see what this boy will be capable of as a devil."

Serafall looks down at him.

"Me too."

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A/N: Thank you for reading my new fanfiction. I hope you enjoyed the first chapter of my new story.

My 'Kenichi: Not Just Her Disciple' story is at chapter 11 – And Complete

My 'Monster Musume: Drago's Quest' story is at chapter 4 – And Complete

My 'Familiar Of Zero: Saving Grace' story is up to Chapter 69