The oppressive aura filled the air, causing Issei to stagger and struggle for breath. Tears welled up in his eyes as he found himself brought to his knees by the sheer weight of the pressure. Akeno and Koneko fared no better, their trembling bodies betraying their fear. Koneko's feline instincts kicked in, her eyes widening with a predatory intensity as her ears and tails emerged.

Gritting her teeth, Akeno mustered the courage to meet the gaze of the new arrival, who sported a wide, unsettling grin. "That would be me," she replied through clenched teeth, determination seeping into her voice.

"Oh? You don't look so good, girl," the man taunted, his voice laced with a touch of sadistic amusement. Issei's heart raced as the pressure intensified, making him question whether flight would be a wiser choice than engaging this man—a predator in their midst.

Summoning her strength, Akeno unleashed a furious roar, invoking her Thunderclap Destruction. A massive bolt of lightning descended from the heavens, aiming to strike the madman directly.

The thunderous impact subsided, leaving behind an eerie silence and a dissipating veil of smoke. Emerging unscathed, the man clutched his head with a mocking grin plastered across his face. "Is that all you've got?" he jeered, his smile sending chills down Issei's spine.

Curiosity and frustration bubbled within Akeno as she demanded, "Who are you?"

"I'm Grimmjow Jaggerjack," the man declared, only to swiftly dodge Koneko's attempted axe kick. Adjusting himself, Grimmjow retaliated, delivering a powerful punch to Koneko's stomach, causing Rias's [Rook], to lose her breath as Koneko was sent hurtling, crashing into a nearby wall.

"Remember this name!" Grimmjow's words hung in the air as Issei's mind raced. He realized that a Dragon Shot wouldn't be enough to defeat this formidable opponent, but it might create an opening for Akeno-senpai to seize.

With newfound determination, Issei saw Koneko regaining her footing, and he summoned every ounce of his remaining strength, sprinting toward Grimmjow with his Boosted Gear roaring to life in his hand.

"[BOOST!]" he shouted, infusing his Dragon Shot with a surge of yellow energy.

"[BOOST!]" he cried out once more, doubling the size and power of the Dragon Shot.

"[BOOST!]" His third boost amplified its strength and size threefold.

"Akeno-senpai!" Issei's voice rang out at the top of his lungs, capturing Grimmjow's attention in the final moments, the mad grin still adorning his face.

"DRAGON SHOT!" Issei exclaimed as his glove connected with Grimmjow's abdomen, the impact resonating throughout his body.

"ISSEI-SAN! RETREAT!" Akeno's command snapped Issei back to reality, and he obeyed without hesitation.

"THUNDEROUS FURY!"

As Issei retreated, a colossal electric dragon materialized from the heavens above. Its thunderous roar announced its impending strike.

...

For a brief moment, all that remained was a deafening hiss as the electric dragon and Grimmjow's immense power clashed. The skies crackled with energy, illuminating the battlefield with an otherworldly glow. The clash of forces sent shockwaves reverberating through the air, shaking the very foundations of their surroundings.

Grimmjow stood firm amidst the chaos, his menacing aura undeterred by the immense power of the electric dragon. With an arrogant smile, he effortlessly raised a hand, gathering a blue energy at his fingertips.

"Pantera destruc-" Grimmjow's words were abruptly cut off as he sensed something, his instincts alerting him to an impending battle between the two [King] — Rias Gremory and Naruto.

"It seems my [King] and your [King] are about to clash," Grimmjow mused, his voice tinged with excitement. In a flash, he disappeared from sight, vanishing with incredible speed using a technique known as sonido.

"What—" Issei's question was left hanging as a surge of immense magical energy filled the air.

The white-haired girl, Rossweisse, found herself confronted by an opponent she had underestimated. The girl effortlessly dodged all of Rossweisse's attacks, skillfully blocking Kiba's sword strikes while effortlessly evading Gasper's time bombs.

"It's five against one..." the white-haired girl spoke, her voice devoid of emotion. With a single finger extended towards Rossweisse, she exuded a terrifying presence.

In an instant, a beam of blinding light erupted from her finger, aimed directly at Rossweisse. Despite her best efforts to defend, Rossweisse found herself unable to withstand the attack. The beam collided with her, overwhelming her defenses and causing her to falter.

"This is so boring..." the white-haired girl remarked dismissively. She effortlessly evaded Kiba's counterattack, delivering a devastating punch to his chest, sending him hurtling through the air to crash against a nearby tree. Gasping for breath, Kiba groaned in pain.

Seeing an opportunity, Xenovia seized the moment to strike a lethal blow against the enigmatic opponent. With her Holy Sword, Excalibur Destruction, raised high above her head, she closed the distance between them with determination.

"Cut through all things in this universe!" Xenovia declared, her voice filled with conviction as she swung Durandal with all her might, intending to bisect the white-haired girl.

But fate had other plans. A resounding clash echoed through the battlefield as Xenovia's attack was intercepted by a towering figure. Standing at an imposing height of 8'1, the man wielded a massive weapon—a combination of a colossal axe head and a flail-like chain.

"Forgive me for being rough, young lady, but enemies must be dealt with," the giant man spoke calmly, his voice carrying a sense of authority. The force behind his attacks was far greater than Xenovia had anticipated, shattering her defenses with ease. Bones cracked and shattered like fragile glass, leaving Xenovia writhing in agony, her body battered and broken.

As Xenovia lay bleeding and barely conscious, the giant man turned his attention to Rossweisse, his companion in this battle.

"We should end this, Rei-san," he suggested calmly, his demeanor unshaken. Rossweisse knew that victory against these formidable foes was unlikely, but she refused to back down.

"Okay, Himejima-senpai," she responded, determination gleaming in her eyes. Though outmatched, she would give it her all.

Meanwhile, Naruto Phenex, the blonde powerhouse, stood before Rias Gremory, her formidable attacks effortlessly countered by his power. A protective barrier surrounded Naruto, rendering Rias' destructive wave ineffective. With a confident smirk, he pointed a finger at Rias, charging a small, seemingly harmless blue orb.

Rias, perplexed by the tiny orb's potential, swiftly dodged it. Within seconds, a massive explosion erupted where the orb landed, showcasing the astonishing power contained within its seemingly insignificant form.

"So small, yet so powerful?!" Rias marveled, realizing the true extent of her opponent's strength. She had expected a challenging fight, but this level of power surpassed her expectations. And all the while, his [Queen] stood silently by his side, observing their battle without intervention.

As the clash between these powerful entities continued, the battlefield remained engulfed in chaos and uncertainty. The outcome of these battles would determine the fates of their respective factions, and the supernova known as Rias Gremory vowed to prove why she held such a formidable title.

NA: Hopefully y'all liked my (updated and better) introduction!

Also made Rias part of the supernovas and Akeno is way more stronger than Canon Akeno.

My reason is simply because every fanfiction related to Naruto/DxD. Akeno and Rias were always weak or not even strong enough to the main cast.

Of course that Naruto is strong asf here but not godlike... yet.

Regarding Naruto's abilities, let's say that the only thing hes gonna keep is the ability yo uze senjutsu in the future and maybe his Rasengan.

Gyomei is Akeno older brother. Akeno is about 17/18 in cannon series and here i made Gyomei in his 27 years, Since he's 25 years old in kimetsu verse.

So far this story gonna feature character's from Bleach, Naruto (yes i plan bring another character from Naruto), Seven Deadly Sins, Evangelion (i found an interesting way to introduce some character's race like rei) and kimetsu no yaiba and jujutsu kaizen.

Naruto Phenex's peerage

Mutated King: Naruto Phenex (Naruto series reincarnated as youngest son of Phenex House.)

Mutated Queen: Merlin (Nanatsu no taizai series with a slightly Orochimaru-like mentality regarding supernatural techniques.)

Mutated Bishop: Rei Ayanami (Evangelion, Angel/Vampire Hybrid)

Bishop: ?

Rook: Grimmjow Jaegerjaquez (Former Sexta Espada, Post TYBW Grimmjow.)

Mutated Rook: ?

Mutated Knight: ?

Mutated Knight: ?

Pawn x2: ?

Mutated Pawn x4: Gyomei Himejima (kny series, Fallen Angel/Human hybrid.)

Pawn x2: ?