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

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[Sixth Secret Sword: Moth's Blade]

The "Moth's Blade" is a sword technique developed specifically to counter enemies with heavy armor. During close combat, the user can channel high-frequency vibrations through the blade, allowing the shockwaves to penetrate the armor and directly affect the enemy's body!

The divine power of the "Tearing Root Hand" was directly injected into the body of the sea demon Yuhai by the Twelve-Winged Fallen Angel avatar. The force transmitted through the vibrations began to tear and churn inside Yuhai's body. In an instant, the sea demon's internal organs were completely destroyed!

"Gahahahaha!!!"

Despite the devastating internal damage, the sea demon Yuhai was incredibly resilient and refused to fall. However, the immense pressure from the attack was undeniable.

As everyone knows, starfish can be pried open!

The Twelve-Winged Fallen Angel gripped the Sword of Promised Victory with one hand and drew the massive Yujue Sword with the other.

"Clang!!!"

The sound of metal clashing echoed as the two swords collided. Under the force of the Yujue Sword, the Sword of Promised Victory successfully breached Yuhai's defenses.

"Rip!!!"

The outer shell was torn open, and the Fallen Angel avatar immediately thrust the Yujue Sword into the gap. The two swords formed a lever, and with a powerful twist, the sea demon's body was pried apart!

"Rip!!!"

Blue blood splattered as Yuhai let out a terrifying roar. Akira, unwilling to touch the disgusting sea demon, had entrusted the vanguard role to the Fallen Angel avatar.

While the Fallen Angel avatar pried open the shell, another attack was launched from the side.

[Extreme-Flame!]

A concentrated blast of ultimate fire shot into the gap created by the Fallen Angel avatar.

"Boom!!!"

The divine flames ignited Yuhai's body, spreading rapidly. The entire area was engulfed in flames. However, the Fallen Angel avatar felt no pain and was unaffected by the inferno.

"Agumon, now's the time!"

[Got it!]

The mechanical dragon raised its claws and unleashed a long-prepared technique.

Under the combined effects of multiple spells—curse, weakening, divine light, tearing, and annihilation—Yuhai's power was drastically reduced.

[This is our chance, Akira!] Agumon urgently reminded.

"I know!" Akira raised his sword.

[Ex—]

[Calibur!!!]

A golden and silver light erupted from the sword, descending upon Yuhai. Unlike before, when the holy sword merely burned the sea demon, this time, the light completely obliterated Yuhai within a massive beam of energy.

"Boom!!!"

The ground was scorched, leaving only molten glass as evidence of the intense battle.

"Now, finish off the remaining one!"

A giga-storm raged, relentlessly eroding the flesh-covered "Lemegeton." If it were an ordinary Lemegeton, it wouldn't have been so troublesome. But considering this one was infused with the will of an outer god and the world's consciousness, Agumon couldn't afford to be careless.

In the end, after the giga-storm, only two pieces of flesh remained: one fused with the Lemegeton and the other with the Golden Fleece. Guided by an unknown will, the Golden Fleece began to merge with the Lemegeton.

[Akira! Separate the Golden Fleece from the Lemegeton quickly! Otherwise, things will get even more complicated!] Agumon urgently warned.

"Separate? How?"

[Use that special chess piece of yours!]

"Got it!"

Without hesitation, Akira charged into the giga-storm. Relying on the massive robot's sturdy body and the powerful defenses of the "Ultimate Steel Battle Mode," Akira managed to move within the storm.

Soon, he reached the core. Without a second thought, Akira forced the chess piece into the fusion.

[Ding!]

[Congratulations, host, for completing the villain check-in!]

[Check-in Level: Gold]

[Check-in Type: Ground Check-in]

[Check-in Location: Lemegeton and Golden Fleece]

[Congratulations, host, for receiving the reward: Outer God's Servant, World's Servant—Sea Demon Yuhai!]

"Wow, that's something."

After completing the check-in, Akira couldn't let it remain. He began gathering energy in the hand touching the Lemegeton.

"Boom!!!"

[Giga Storm!!!]

A torrent of energy surged, adding another layer to Agumon's giga-storm.

As for the Golden Fleece, after the chess piece was forced into it, it disappeared. A beautiful girl with long purple hair began to materialize in the air.

"Huh?"

Akira raised an eyebrow and quickly reached out to grab the newly reborn girl.

"Boom!!!"

The thrusters on his body activated. With one hand maintaining the giga-storm and the other holding the purple-haired girl, Akira gradually expanded the storm's range.

However, before he could fully exit, the storm subsided. With the Golden Fleece gone, the Lemegeton quickly disintegrated within the giga-storm.

As the storm dissipated, Akira gently opened his massive hand and placed the purple-haired girl on the ground.

"Phew..."

Akira let out a long sigh, feeling the exhaustion of using the giant robot mode and stacking so many abilities.

"Ah..."

The purple-haired girl seemed unwilling to let Akira lie on the ground and quickly supported him, placing his head on her lap.

"Are you... the hero who saved me from the evil god?" the girl whispered softly.

This beautiful girl with long purple hair was Medea. In this world, Medea was the victor of the Holy Grail War. Ten years later, she would be summoned again, but this time, she would rebel against her master.

As she lay on the ground, someone reached out and pulled her up.

"You are... Medea?"

"Yes, Master. I am Medea, your servant."

As a sorceress from the Age of Gods, Medea quickly understood her relationship with Akira and the significance of their bond. She could feel the changes that occurred after forming a contract with him. She had become his servant, and he, her master. This relationship was absolute and unbreakable.

"Master, you've expended a lot of magic power. You should rest and recover before moving again."

"All living beings have a limit, similar to 'metal fatigue.' When the body reaches its limit, it needs proper rest."

"Alright."

Akira relaxed, enjoying the comfort of Medea's lap. He had never seen such a gentle side of Medea before. Was this really the same dark and vengeful Medea he knew?

"By the way, Master, I have a way to help you recover your magic power." Medea's eyes sparkled as a blush spread across her delicate face. Before Akira could respond, she leaned in and kissed him.

At that moment, Agumon, who had just de-evolved, was rushing toward Akira. She arrived just in time to see Medea kissing him.

"Huh?"

Agumon frowned, feeling an inexplicable pain in her chest. Despite her strong body, she felt as though she couldn't breathe. This wasn't the first time she had felt this way. Every time she saw Akira getting close to another girl, she felt this unbearable discomfort.

"Seiya..."

Agumon softly uttered the name she had given herself. She wanted Akira to call her "Seiya" instead of "Agumon."

"Once I evolve into my ultimate form and gain a new appearance, I'll make Akira call me 'Seiya,'" Agumon resolved.

Meanwhile, outside the battlefield, Rin Tohsaka was munching on chips while watching Akira's battle with the sea demon Yuhai. Agumon had trapped Yuhai in a mirror world and sealed it with a forbidden spell, but she hadn't moved it to another dimension. Thus, Rin and the others could still see the battle.

By the time the battle ended, Rin had just finished her chips. She licked her fingers, savoring the last bits of flavor.

"Damn, that guy might really have the qualifications to be exiled by the world!"

Rin had been reluctant to admit it, but now she had no choice. Akira hadn't been lying. His exile had altered the world, leading to the future she now knew.

"Rin, are you okay?"

A familiar voice snapped Rin out of her thoughts. She froze, her eyes filling with tears as she turned toward the source of the voice.

"Mom... Mom?"

Seeing the maternal figure of Aoi Tohsaka, Rin couldn't hold back her tears any longer. She rushed into her mother's arms.

"Mom! I missed you so much!"

As she hugged her mother, Rin felt a mix of emotions—gratitude and guilt. She was grateful to see her mother again but guilty for not being able to protect her father.

"Dad... he's already dead, but you're still here. That's what matters!" Rin said tearfully.

At those words, Aoi's body stiffened.

"Rin's father... who was that again? Did Kariya die? When did that happen? No... that's not it. Rin's talking about Tokiomi!"

Aoi felt a strange sense of relief upon hearing that Tokiomi was dead.

"Tokiomi is dead? How?" Aoi asked softly, gently stroking Rin's back.

"He was... killed by his disciple, Kirei Kotomine," Rin replied, her voice filled with hatred.

"Kirei... Kotomine?" Aoi's expression was complex. Strangely, she felt a sense of gratitude toward Kirei. Thanks to him, she no longer had to feel guilty about choosing Akira. She was no longer a cheating wife but a widow seeking love.

Although Aoi had already betrayed Tokiomi after her night with Akira, the decision had been painful. Telling Tokiomi that she had chosen Akira, that Akira was stronger, would have been too cruel. Tokiomi had already suffered enough, and she didn't want to hurt him further.

So, Aoi felt that Tokiomi's death at Kirei's hands was... a blessing.

"Mom, I'll kill Kirei again! I'll avenge Dad!" Rin declared coldly.

"Rin, be careful. If there's anything you can't handle, remember to come to me," Aoi said gently.

"Wait, Mom, you don't know magic. Why are you telling me to come to you?" Rin asked, confused.

"That's because of me!"

Another familiar voice rang out. Rin turned to see a younger version of Sakura Tohsaka.

"Sakura! You're here too!"

Rin felt relieved. In the future, she and Sakura had worked well together. Sakura's arrival meant she had another ally.

"Rin, long time no see," a childish yet mature voice chimed in.

"Illya!"

Rin was even more reassured. With Illya here, she could confidently take on Kirei. It would be three against two—her, Sakura, and Illya versus Kirei's Lancer and Gilgamesh.

Note: So far this story is published up to chapter 100 on my patreon go take a look and remember if you reach 210 stones of power I will publish the next chapter.