In DxD Starting with Sign-Ing in as the Red Dragon

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Akira's mission for Jeanne was clear: eliminate any unforeseen variables that could disrupt the Holy Grail War. The primary directive was to eradicate the hidden threats lurking within the Holy Grail, ensuring that its corrupted form would vanish. At first glance, the tasks seemed straightforward, but as always, the Holy Grail War was anything but simple.

Meanwhile, in a small French village, a young maiden who hadn't even finished her basic education displayed an astonishing level of wisdom:

"If there's no conflict, then why not create one?"

She smirked to herself, proud of her cunning plan.

Elsewhere, Matou Kariya observed the battlefield through a telescope. His body had recovered, but at a cost—he had lost his ability to control insects.

"Damn it," he muttered under his breath.

As Kariya continued to monitor the situation, the scenery within the water orb beside him suddenly shifted.

"It's here! Akira's signal!"

Kariya quickly put down the telescope and shouted,

"Streetlamp! That golden bastard is standing on the streetlamp again! Berserker! Take him down!"

With a deafening roar, Berserker materialized out of thin air, his black armor gleaming ominously.

"What's going on?!"

Irisviel jumped in surprise. She had assumed someone was trying to ambush her, but the black-armored Servant ignored her completely, focusing solely on the golden figure atop the streetlamp.

"Who dares interrupt my leisure time?!"

A deep, arrogant voice echoed from above. Golden ripples appeared in the air, and a shining spear shot forth from the Gate of Babylon.

Berserker, with his unmatched combat skills, caught the spear mid-air and hurled it back with incredible force.

"Just as Akira predicted, that golden fool loves throwing weapons around!" Kariya grinned. "Berserker's ability to turn his enemies' weapons against them is perfect for this!"

The golden Servant, Gilgamesh, barely had time to react as the blackened spear pierced through his defenses, severing one of his arms. Blood splattered across the ground, painting a macabre scene.

"What?! The King of Heroes... injured?!"

Tokiomi Tohsaka's eyes widened in disbelief. How could the mighty Gilgamesh be overpowered by an unknown Servant? Was this even the real Heroic Spirit he had summoned?

Gilgamesh, however, was far more enraged than Tokiomi. The humiliation of losing an arm in their first encounter was unbearable.

"You insolent mongrel!" he roared, his crimson eyes burning with fury.

Dozens of golden ripples opened in the sky, each unleashing a legendary weapon from the Age of Gods.

"Berserker! Finish him while he's down!" Kariya commanded.

Berserker, though consumed by madness, moved with precision and speed, closing the distance between himself and Gilgamesh. The King of Heroes, realizing the danger, summoned his divine vessel, Vimana, and took to the skies.

"Chase him, Berserker! Don't let him escape!" Kariya ordered, his eyes gleaming with determination. Today, he would humiliate Tokiomi Tohsaka by defeating his Servant.

Berserker leapt toward a nearby fighter jet, his hands transforming the machine into a blackened, demonic version of itself. With a roar, the jet took off, pursuing Gilgamesh into the heavens.

Meanwhile, on the bridge, Rider—Iskandar—laughed heartily.

"Hahaha! The Holy Grail War has finally heated up! This is what I've been waiting for!"

He turned to his Master, Waver, who looked utterly terrified.

"Come on, boy! Let's enjoy the show!"

Back at Akira's base, Aoi Tohsaka watched the events unfold through a water orb.

"Akira... please, help Tokiomi," she pleaded, her eyes filled with desperation.

Akira, however, shook his head. "My Master is Sakura. I cannot engage in prolonged battles without her consent."

Aoi's face fell, but Akira continued, "However, there is another way. Have you heard of... mana transfer?"

Aoi's eyes widened as Akira explained the process. After a moment of hesitation, she nodded.

"I... I'll do it. I'll provide you with the mana you need."

As Aoi lay beside Akira, her emerald hair cascading around her, the mana transfer began. Unbeknownst to her, Akira's demonic heritage was at work, subtly influencing her mind and body.

[Ding!]

[Host level increased to 135 (High-Class Devil).]

Akira's demonic nature thrived on manipulation and temptation. As the transfer continued, Aoi's resistance crumbled.

"Aoi Tohsaka, will you form a contract with me? Join me and Sakura, and we'll be together forever," Akira whispered into her ear.

Tears streamed down Aoi's face as she finally gave in.

"I... I accept. I want to be with Sakura... and with you."

[Ding!]

[Congratulations, Host! You've completed a Villainous Sign-In!]

[Reward: Magic Circuit Body.]

Akira's body surged with power as his new abilities took hold. However, the system issued a warning.

[Warning! The World's Will has detected your actions. You are being expelled from this world.]

Akira smirked. "Expel me? Not so fast."

He activated all his powers, drawing upon his contracts with Ophis and the Heavenly Dragons. The World's Will fought back, but Akira's determination was unshakable.

In the DxD world, Ophis, the Infinite Dragon God, suddenly felt a strange sensation. Her power was being drained at an alarming rate.

"What... is this?" she murmured, collapsing to her knees. "Akira... what are you doing?"

Back in the Type-Moon world, Akira emerged victorious.

[Ding!]

[World's Will expelled. Reality successfully altered.]

Aoi, overwhelmed by the influx of memories and sensations, clung to Akira, her mind and body utterly spent.

Note: So far this story is published up to chapter 85 on my patreon go take a look and remember if you reach 140 stones of power I will publish the next chapter.