Hello fellow readers. So after reading many a crossover stories, I decided to write one of my own. This story was inspired by Rosario to Kiva (by Kamen Rider Chrome & Ten-Faced Paladin) and High school DxD: Destiny's Play (by Otaku-Nation666 & Code-Emperor07). It will follow mostly the DxD storyline but there will be some following the Kamen Rider Kiva series. Hope you all enjoy. And please review, follow and favorite this story. I own nothing of this two series.

Chapter 1: Rebirth

Red…. that was all he could see. He wondered why? The red reminded him of someone. He then recalled, he was doing something, it was important. But what was it? Some buzzing noise was interrupting his thoughts. He wanted to swat away whatever it was but his arms were heavy. He recalled that he was in the park, a girl seemed to be in trouble. He tried to help and felt a piercing pain and things went dark.

Flashback earlier that day…

It was another day in Kuoh academy. It was once a private all-girls academy, but soon enough that all changed. Now it was co-ed much to the delight of many. For the girls it was fawn over the popular boys like Second year Nago Keisuke, the Golden Boy of Kuoh academy. Great a t sports & in grades plus incredibly handsome it was only a matter of time before he got a fan club. The fact he despised such "trivial" things (his words) made girls gush even more. Then there was First year Kiba Yuuto, a bishonen if there was one. Always with a smile that made girls weak at the knees as he passed by. The desire of all the girls and the envy of many boys.

While this happened there was a certain individual that kept away from that routine. He had brown hair that was spiked unruly, He wore the standard uniform which consists of a black blazer, over a white, long-sleeved dress shirt with black highlights with a black ribbon on the collar, matching black pants, and brown dress shoes. But his differs as he had a red shirt underneath his open white shirt and he had a red scarf wrapped around his neck. This teen was Issei Kurenai another favorite of the female students. He was currently looking for something amidst the bushes.

See during his off hours from school, Issei was a violin maker. He made them and occasionally fixed some at the request of others. But his true goal was to build a violin that would surpass the one known as Bloody Rose. This certain violin was made by his father. As such he looked for unique ingredients to use for the varnish of his violins. Which brought back to what he was currently doing. He had found some interesting looking snails that would work great for the varnish. The sheen of the shells, the color of the mollusk may be his chance at the right path for the violin of his dreams.

Issei then realized than in his search he had stumbled upon one of the old school buildings. As he looked up he noticed someone. To his surprise and wonder it was one of the Two Great Ladies of Kuoh High. Rias Gremory. The epitome of beauty according to many students both male and female. While people talked about her voluptuous body at such an age (Issei had noticed but unlike others kept those thoughts to himself), or her cool personality so mature and calm. To Issei what called to him was the color of her hair. The color of it, it was an incredible shade of red that to him the mere word paled to truly call it that. It was then that she looked towards him and smiled. With a jolt and much blushing Issei realized he had been staring at her and in a panic run back in the direction he came from. He felt his face heat up at such a bold action of his.

After school Issei had gone to the park to look for other ingredients. As he did he passed by a woman who gave him a flier, it was an odd symbol, probably for some new restaurant or club. He put it in his pockets as he went to the park. It was a great place to find variety of ingredients. One was a certain fishbones that was in the meal a cat was currently eating. Part of him was debating whether to disturb the cat by taking his meal, while the other part preferred to wait until the cat finished. As he sat in the seiza position during this ordeal, he heard a scream. He looked up to see a girl being harassed by a strange middle-aged man in a long coat and hat. Seeing the man for some reason made his blood boil. He didn't know why. All he knew is that one moment he was in the seiza waiting for some fishbones. The next he got up and was racing towards the two people and tackled the man.

Said person grunted in surprise before he was flung to a nearby fountain. Issei glared at him before checking on the girl.

"Are you alright?" he asked. "Do you need anything?"

The girl nodded. "Y-yes I do need something."

"What do you need?"

"Your life!"

He then felt a sharp pain and found what look a spear of light in his abdomen. He looked up to see the girl wearing a manic grin. Suddenly her dress changed into clothing that covered very little on her body. If it wasn't for the pain he was feeling, Issei would've been blushing by now. Meanwhile the woman was laughing.

"Oh how easy it is to lure you humans," she boasted. "Some trouble and waterworks and voila! A sacred gear for our pleasure."

She kept talking but Issei could barely hear her as he fell in a pool of his own blood. As he laid there, his life slowly seeping away, he didn't think of his father, or the ultimate violin. No, his last thoughts were of beautiful red hair flowing in the wind.

The sun shone through his window waking Issei up. It stung him as he groaned and tried to block them from his face. He didn't want to get up. Grabbing his pillow he tried to cover his face with it. As he did he heard a soft moan that he ignored for a second. He cautiously gripped the pillow again and heard the moan a bit louder. He opened his eyes and found himself face to face with breasts! But to utter shock, embarrassment and horror he found himself face to face with Rias Gremory.

Needless to say he began to flop about in a panic as he tried to separate himself from her. Instead he slipped on a blanket and fell head first in her chest again. This woke her up. Issei was expecting a beatdown for his actions, instead he felt a caress. Eyes widening he look up to see Rias smile at him.

"Well, for someone so quiet I never expected you to be so bold Kurenai-kun," she teased. Issei felt his cheeks heat up at her statement. He tried to explain but she just shushed him. "It's alright Kurenai-kun I was only jesting. Now let's see how you are."

To his shock and surprise she flipped him with ease in the bed and began looking him over. Issei felt that if he blushed even more he was gonna pass out. Especially when he realized that he was naked as well. Rias unbothered by her kohai's distress.

"Well the wound certainly healed well. There's barely a scar at all seems you are quite the fast healer Kurenai-kun." she stated.

That seemed to snap him out of his hyperventilating. He looked at her shocked. "T-that wasn't a dream?!" he asked, more like pleaded. Rias just gave him a grim look before shaking her head. Then she began to tell him everything. About how she was a devil! Of all things he never expected that. His even greater shock was how he was a devil having summoned her as he was on the verge of death. As if his life wasn't weird enough.

She then looked up to his clock. "I will have to cut this short Kurenai-kun, otherwise we'll both be late for class. I will send someone to you so we can continue with this discussion." With that she summoned a circle with many symbols, gathered her clothing and disappeared, leaving behind a very shocked teenage boy.

Issei walked down the stairs lifelessly. Never he would've thought to have a morning like the one today. He reached his kitchen as he attempted to make some breakfast before going to school.

"My, my," spoke a voice behind him. "I never expected for you to do such a thing Issei."

"Kivat!" Turning to a violin decoration on the wall. Inside of the hallowed instrument was a cartoonish mechanical bat with a black and gold roundish body and a face with red eyes, a triangular gemstone in his forehead, triangular ears, wings and small legs below his mouth which had four pointed fangs.

"Now, now Issei, you are at that age in which to seek lady companionship," said the bat. "Its nothing to be ashamed about. In fact kudos for going all the way."

Issei wanted to bash his head against the counter. "It's not like that, didn't you hear what Rias-sempai said?!"

"Calm down Issei, I was only teasing." Kivat flew from his place to perch in the teen's shoulder. "Besides just like she still has much to tell you, so must you tell her about your secrets."

Kurenai wilted at his words as he looked towards a glass case. Inside of it was the violin known as the Bloody Rose, his goal by making the greatest violin by surpassing this one his father made. Besides it was a picture of a man in a black suit, at her side was a beautiful woman. This two were his parents, both of them made the Bloody Rose. It was a story he always loved to hear as a child. It always brought him some sense of peace during turmoil. Now at that moment it only brought him despair. "Trust me Kivat, I know."

As he walked to school he got weird looks from many. It was due to the fact he wore a mask to cover his mouth, goggles, a snow cap, a vest and gloves. The reason was he felt strangely ill. It was as if the bright day made him ill. Was it the side effects of being reborn as a devil? He didn't know, but the faster he got to school the better for him. Naturally he got weird looks at school but he ignored them as he always did. As he entered he felt much better and took off his extra attire and leaving his usual uniform and scarf.

Class passed by with the usual routine. For him it was making notes of the ingredients he had used and the ones he hadn't for the varnish. He still hadn't tried the fishbones nor the snails so he had to find some. He didn't noticed how the class suddenly hushed down or that someone was in front of his desk until a cough alerted him. Looking up he was surprised to see the school's prince Yuuto Kiba there. He looked behind the blonde boy to see everyone in groups speaking about the encounter. Kiba naturally ignored all of this.

"Good day Kurenai-san," he greeted, Issei for his part just nodded warily. "I was sent here to escort you to Buchou-san." The brunette pondered this until he realized he meant Rias-sempai. He nodded and got up following the other boy.

As he did he heard the whispers.

"Why is Kurenai-kun leaving with Yuuto-kun?"

"Maybe it's a territory thing?"

"Maybe they are long lost brothers!"

"Bet they are gay." This was courtesy of the school Perverted duo Matsuda and Motohama. This got them either a beat down from some of the girls for their antics and lecherous thoughts from the rest.

Issei for his part just sweatdropped at the envy from those two and the his female classmates antics. The two teens soon left the main building and towards the old school building. Kiba looked to see the other guy's curious look and said: "Our Occult Research club meets here. It's more private and away from prying eyes when we do our other assignments." Kurenai nodded at this explanation as the reached the last floor. Issei heard a discussion going on to his surprise.

"... they are getting more bolder." said a voice, it was Rias-sempai.

"Ara, ara they always were the most warlike of the Factions Buchou."

Kiba knocked interrupting any other reply. A quick "Come in!" and they entered. The place was amazing with a certain Victorian style in its decoration. Sitting behind a desk was Rias Gremory, who had a thoughtful look on her face. At her side was the other of the final member of Two Great Ladies of Kuoh High, Himejima Akeno. Even more voluptuous than Rias, with raven hair that fell to her back and was currently tied up in a ponytail, she was a sight to turn the head of a priest. There was a rumor that such incident did happened one time. To round up this gathering, at a couch sat a petite girl with white hair and hazel eyes. She was currently eating a pastry of sorts. This the "mascot" of Kuoh Academy Toujou Koneko.

"Welcome Kurenai Issei," greeted Rias. "As promised I'll continue our conversation from this morning."

Issei was certainly shocked about the life of a devil. More than that an ancient war between the four strongest Faction and the reason why the devils created the pieces system.

"S-so the peerage is bases on the game of chess correct?" he asked. Akeno served him tea and after thanking her drank some. "Delicious!"

"Fufufu, why thank you," she answered with a smile that made him blush. This just made her want to tease him even more but Rias continued.

"That is correct," she the crimson-haired girl. "Each chess piece serves a purpose as in the game along with certain abilities given to them."

Issei drank more tea as he mulled her words. "Kiba mentioned other assignments, what did he mean by that?"

"As I told you while we are currently at peace with the Heaven, Fallen & Fangire factions, there always some that go rogue and attempt to start something. As such we are sent to engage them once we get the clear from our superiors." She then got up and to the teen's surprise touched him lightly in his cheek. "Don't worry Issei-kun," he noticed the change. "I can feel your apprehension at this new life, but rest assure, you are not alone. Also any danger as the one you suffered will not happen as long as I am here."

"H-hai Buchou," he answered.

"Now since you are still recovering I suggest you go home and rest. Tomorrow we'll get you started on your tasks as a member of my peerage. Also you will begin club activities as well."

Issei nodded and bowed before he left. It seemed now that as a devil light and holy relics left him weak and could harm him more than normal. Maybe after practicing the violin he would sleep in early. As he left the school he heard it. The Call of the Bloody Rose. The Call to fight. Issei ran to where the sound guided him.

Rias and her peerage were currently facing off against a rogue Fangire. One of the race of the four Factions, the Fangires were the most dangerous as they fed on human life force and were the most war-like against others. One of the members of the Mazoku races, they destroyed many others minus the Devils during the Great war. After the war they were some that always caused trouble.

The Fangire that looked like an owl, It had a bulky body covered in its wings that were currently out and attacking, its face had eyes the size of saucers and a small beak, it hand talons serving as both hands and feet and had currently fed on the life force of a couple walking by. The feeding had given it the strength to hold its own against the club members.

Koneko tried to kick him but the Fangire dodge it and punched her away. Kiba then pulled a sword and was about to attack but the Fangire used one of it wings to block him. It was clearly a skilled warrior.

"You puny devils," it sneered, "it's going to take more than a little girl and her servants to take me down."

"Don't be so sure of victory Fangire," declared Rias. She raised her hand and went in a stance.

"Oh will I see the blood of the Gremory clan in action? Oh what a treat, your life force will be exquisite." It raised its arm as Kiba and Akeno quickly went in front of their king to defend. But suddenly something flew past and hit the Fangire.

They saw it was a mechanical bat who kept biting the Owl Fangire.

"Yosh, let's go Issei!" They turned to see their new member coming towards them with a determined look.

"Kivat!" He called. The bat flew to his hand and use it to bite him in his other arm.

"Bite!" said Kivat. As he did markings appeared around Issei's face. Chains roped themselves around his waist before they turned into a belt.

"Henshin!" called Issei and as he put Kivat in the center of the belt upside down, he was wrapped in chains before they melted away and broke. To their surprise in the teen's place was an armored form. He was clad in full-body dark suit. The torso had a metal vest with a high collar along with a red breastplate that looked like muscles, the shoulder armors were shaped as dragon heads. He wore red gloves with silver bracelets and chains wrapped around his right arm. His right leg was also covered in silver metal and chains also. The left had a serpentine dragon wrapped around it. His helm was black, with the visor shaped as a pair eyes and edged in red, they were called Omnilens. At the top it resembled bat mouth guard was framed silver and with black fangs. His belt had at its side several ornate whistles.

All of them were left in shock but no more as the Fangire itself.

"K-Kiva!" It yelled.

"Kiva?" Said Rias in surprise. The rest of the Occult club was left shocked as well.

Kivan quickly went in a battle stance before rushing the Fangire tackling him. With a screech the Owl fangire attempted to use its wings, but Yuuto quickly cut them off by cutting one of them. Kiva nodded his thanks before unleashing a barrage of punches and kicks at his screeching opponent. The fangire tried to counter attack but was quickly being subdued his armored foe, it was clear Kiva wasn't going to take any chances. It was time to end it.

Kiva pulled one of his whistles and perched it on Kivat's mouth. Blowing on the instrument the bat yelled, "WAKE UP!" And the sky turned pitch-black, a crescent moon suddenly was out. Kivat flew from its perch before breaking away the metal from Kiva's right leg to reveal a pair of red wings. He then jumped into the air, before he fell at rapid speed kicking at the shockwave caused for the ground to be left with an insignia. The mark of Kiva, the Fangire suddenly turned into mosaic-like glass before it shattered to pieces.

All was quiet as Issei reverted himself to his normal form. Turning he saw the peerage looking at him in awe.

"I guess I have some explaining to do," he said sheepishly.

And scene. Now Issei's identity is revealed what will this mean? Also he will have the Boosted Gear but that will come in later. Characters from both series will make appearances with time but not in the way you'd expect. And yes other riders may appear in the story and depending how it goes will have their own arc with Issei and the rest. I may update in the weekend it all depends as I am dealing with finals and it's a hectic time. Until next time.