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

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"Roar!!"

The remnant soul of the Black Evil Dragon King, Vritra, went berserk. The aura of the evil dragon rapidly spread, and the life force of the earth began to wither at an alarming rate. The ley lines were quickly being blocked due to Vritra's rampage. Blockage and flooding—this was the mythological essence of the Black Evil Dragon King, Vritra.

In the original storyline, when the four Dragon King Sacred Gears were combined, Kiba Yuuto had once used the "Dragon King's Manifestation" to transform into Vritra's true form and temporarily restrained the rampaging nine-tailed fox, Yasaka. This perfectly aligned with the mythological essence of Vritra. The nine-tailed fox was the ruler of Kyoto's ley lines, and to restrain her, one had to block Kyoto's ley lines—something Vritra excelled at.

Using its evil energy to transform the surrounding environment into its preferred state, the remnant soul of the evil dragon began attacking everything around it, driven by its primal instincts.

"Roar!!"

The evil dragon let out a deafening roar.

Black-purple miasma surged wildly in all directions.

Not far from the evil dragon, Sona was putting up minimal resistance, using Maou-level water magic to block the black-purple miasma. Sensing someone trying to stop it, the remnant soul of the evil dragon turned its body, focusing most of its attacks on Sona.

"Sizzle!!"

The air was filled with evil energy as the black-purple miasma splashed everywhere. Countless black-purple "dragon veins" emerged from the evil dragon's body, relentlessly chasing Sona as she darted through the air at high speed.

These "dragon veins" were named [Black Dragon Veins]. They could connect to other life forms, draining their energy and life force. It was an extremely sinister ability. Thus, Sona had to keep moving at high speed to avoid being connected by the Black Dragon Veins.

"Strength is... at the peak of Maou-level, almost reaching Super Maou-level," Sona analyzed as she flew. "As expected, a remnant soul like this can't reach Super Maou-level. But this aligns with my expectations. If Akira were to reveal strength beyond Maou-level now, it might cause unrest between the old and new Maou factions in the Underworld."

"Maou-level strength is just right. Revealing Maou-level strength won't provoke the current Maous, but it will still attract some Devils—both old Devils and reincarnated or mixed-blood Devils."

Sona was well aware that Akira wasn't aiming to gather old Devils to rebel against the new Maous. Instead, Akira sought to fundamentally change the current state of the Underworld through reform. Step by step, Akira was building his influence. Sona's role now was to use this opportunity to elevate Akira's reputation and begin gathering forces.

Akira had already started gathering forces elsewhere. The Underworld... could now begin its preparations.

Sona looked at Tsubaki, who was being controlled by the rampaging dragon soul, and softly said, "Don't worry, Tsubaki. You will be saved. But... the one who saves you won't be me. It will be... Akira."

As if responding to Sona's thoughts, a teleportation circle lit up on the ground. In the next moment, Akira emerged from the circle.

Seeing Akira arrive, Sona immediately made her request.

"Akira, you're here. Can you handle this evil dragon soul for me?"

"Sizzle!!"

The black-purple miasma surged toward Akira, but he raised his hand and activated a divine-era defensive spell. To be precise, it was a fusion of the divine-era spells from the Fate world and Agumon's techniques. While learning "foreign languages" from Medea, Akira had also picked up quite a few divine-era spells.

The rampaging dragon soul instinctively attacked all life forms around it. Sensing that Akira's life force was stronger than Sona's, the remnant soul of Vritra turned its focus toward Akira.

After blocking Vritra's evil energy, Akira looked up at Sona in the air.

"Sona, you knew that Tsubaki's compatibility with the Black Dragon Veins wasn't high. Why did you force the transplant?"

"Why?" Sona adjusted her glasses with a smile. "Because this gives you a chance to win Tsubaki over."

"Akira, didn't you tell me that you had no intention of hiding your strength and were planning to expand your influence? So... this is a perfect opportunity to kill two birds with one stone."

"If the transplant succeeds, it can help complete the remaining quarter of the dragon soul. Even if it fails, you can showcase your strength and win Tsubaki over in the process."

Akira pondered for a few seconds.

Wow, Sona was really something. She was selling out her best friend with such ease, hoping that Akira would save Tsubaki and significantly boost her affection in the process. This level of scheming showed that Sona had already come to terms with many things.

No, to be precise, ever since she helped Akira win over Seekvaira, Sona had already accepted many realities.

"Alright, Sona. I understand. Leave this to me," Akira nodded.

He had no reason to refuse something that was handed to him on a silver platter. Besides, Tsubaki Shinra was also one of his targets. Even if Sona hadn't created this opportunity, Akira would have made his move eventually. Now, it was just a matter of opening the box early.

"Whoosh~"

Akira extended his hand, and under his control, the defensive spell rapidly contracted, closing in on the evil dragon soul within a few dozen meters. Although Akira was only a high-tier Maou, his attributes were exceptionally high. Even without using his Balance Breaker, he could completely suppress opponents below Super Maou-level.

Seeing Akira prepare to act, Sona softly reminded him, "Akira, Tsubaki has always liked you. As her King, it's my duty to help my servant pursue love, isn't it?" Sona's smile was warm but carried a hint of mischief.

"Yeah, Sona. I already knew Tsubaki liked me," Akira replied with a helpless smile.

When a woman likes a man, she may not confess directly, but she will drop hints in various ways. Tsubaki had given Akira such hints, more than once. Unfortunately, after Akira broke off his engagement with Serafall and became engaged to Sona, Tsubaki had stopped showing any signs of affection toward him.

Akira understood why Tsubaki liked him. Her type was a handsome man with a gentle smile. In the original storyline, Tsubaki had fallen for the blond-haired Kiba Yuuto, though it was after losing to him in battle. But in this world, there was only Kiba Yumi, not Kiba Yuuto. Thus, it was natural for Tsubaki to develop feelings for Akira. Even without the high-dimensional succubus bloodline, Akira's looks were top-tier.

[Boost!]

As Akira walked forward, the Red Dragon Emperor's Gauntlet manifested on his hand.

[Red Dragon Emperor's Gauntlet! Balance Breaker!]

[Welsh Dragon Balance Breaker!]

[Balance Breaker: Scale Mail of the Red Dragon Emperor!]

"Clang! Clang! Clang!"

Crimson armor enveloped Akira's body, and the green jewel emitted a surge of spiritual energy that instantly crushed the ground beneath him. With the activation of the Scale Mail, Akira's power stabilized at Super Maou-level.

[Super Maou-level! Akira isn't hiding his strength at all!?] Sona lightly covered her mouth in surprise. She had thought that "peak Maou-level" was a safe range, allowing Akira to make a name for himself without causing too much disturbance. But she hadn't expected Akira to reveal his Super Maou-level strength without hesitation.

Super Maou-level! Even among the leaders of the three great factions, only a few possessed such strength. On a global scale, Super Maou-level beings held significant influence—legendary dragon kings, minor gods of small pantheons, and so on.

[Akira did tell me he wasn't planning to hide his strength, and I based my decision to have Tsubaki attempt the transplant on that information. But I never expected Akira to reveal Super Maou-level strength outright!]

Sona's rose-colored eyes trembled as she looked at Akira. Though she didn't know why Akira was doing this, she trusted him. If Akira chose this path, she would support him wholeheartedly.

[Akira. Like the mythical Indra, slay the evil dragon soul and claim your glory and legitimacy.] Sona gazed at Akira's back, silently urging him.

Indra, originally named "Indra," was born to liberate the world's waters blocked by Vritra. He obtained the weapon Vajra from the craftsman god Tvastar and requested Vishnu to mark a battlefield spanning three steps across the universe. Before the battle, Indra drank large amounts of Soma to enhance his strength. He then destroyed Vritra's ninety-nine fortresses. During the battle, Indra's two jaws were shattered, but he seized the opportunity to hurl Vritra into the already destroyed fortresses, killing the dragon. Thus, Indra earned the title "Vritrahan," meaning "Slayer of Vritra." The Black Evil Dragon King Vritra was an integral part of Indra's myth.

Slaying Vritra was the greatest source of Indra's legitimacy. What Sona wanted now was to recreate Indra's legend. By subduing the remnant soul of the evil dragon, Akira's reputation among the younger generation would skyrocket to its peak.

[Boost! Boost! Boost! Boost! Boost! Boost!!!]

Crimson and green light illuminated the withered land. Waves of white energy spread outward from Akira, dispelling Vritra's "blocking power." Soon, the evil energy corroding the ley lines was neutralized, and the remnant soul of the evil dragon let out an unprecedented roar of pain.

For the remnant soul, standing on pure immortal energy was like throwing ice into molten lava. If it were the true dragon king, it might have been able to contest Akira for control of the ley lines. But a mere remnant soul stood no chance against Akira.

[Dragon Shoot!]

"Boom! Boom! Boom! Boom! Boom!"

Infused with pure immortal energy, Akira's "Dragon Shoot" continuously weakened the evil dragon's miasma.

"Roar!!"

Dozens of Black Dragon Veins shot out from the evil dragon's body, aiming straight for Akira. But Akira... simply stood his ground.

As the Black Dragon Veins entered his body, the remnant soul instinctively began absorbing Akira's energy and life force. But Akira... had been waiting for this moment. Most people couldn't resist the Black Dragon Veins, but if one's energy control surpassed even the true Vritra, they could reverse the flow and use the Black Dragon Veins to corrode the evil dragon itself!

"Sizzle!!"

Golden holy energy surged from Akira's body, flooding into the remnant soul of the evil dragon. This was... the holy energy of Agumon!

"Screech!!"

The holy energy caused the remnant soul to let out an agonized roar.

"Pop! Pop! Pop! Pop!"

With the Black Dragon Veins turned against it, the absorption effect became self-destructive. For the first time, the remnant soul of Vritra retracted its veins before its enemy fell.

Now, the remnant soul had absorbed a significant amount of holy energy, causing its form to become translucent and emit wisps of white smoke. Seizing this moment of weakness, Akira drew the "Dragon Slayer Sword."

[I swear here—]

[I will not allow anything in this world that I cannot cut...]

[This sword is the blade that can sever and cut through all existence on earth! An invincible blade!]

Holding the empowered Dragon Slayer Sword, Akira's Scale Mail emitted blazing green spiritual flames.

[Boost! Boost! Boost! Boost! Boost! Boost!!!]

Accelerating to his limit, Akira's figure vanished.

[Ultimate Secret Sword—Shadow Pursuit!]

A silver flash streaked through the air.

In the next instant, Akira reappeared on the other side, holding a tall, bespectacled beauty in his arms.

Note: So far this story is published up to chapter 145 on my patreon, go check it out and remember that if we reach the goal of 130 power stones I will publish the next chapter.