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

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"Rin, what's wrong?" Saber asked with concern.

The last time Rin had been this upset was when she failed to save Tokiomi Tohsaka. What could have happened this time?

"Saber, you're the only one I can rely on now..." Rin clutched Saber's hand tightly, like a drowning person grasping at their last lifeline.

If it were Saber, who had failed to save her own kingdom, who carried so much guilt in her heart, surely she would understand, right?

"Rin, did something happen? If sharing it with me would make you feel better, I'm more than willing to listen," Saber replied gently.

"Saber..." Rin looked at her, slightly stunned.

Was it just her imagination? Saber seemed... more understanding than before. Sure, Saber had always been considerate and caring toward her, but this felt different somehow.

"Rin, what's wrong?" Saber asked, tilting her head slightly.

"No, it's nothing. It's just... something happened," Rin began, deciding not to press the matter further. Instead, she started to recount her troubles.

A few minutes later, after finishing her story, Rin drank several glasses of water to soothe her throat. Her mood had improved slightly after venting.

"So, that's what happened. My mother has arranged a marriage for me. She wants me to bear a child who can inherit the Tohsaka family. I don't mind having a child, but... how can I possibly develop that kind of relationship with someone who is technically Sakura's master? What is my mother thinking? It's ridiculous!"

"Rin, there's an obvious solution to this problem," Saber pointed out calmly.

"What solution?"

"Simply... become a devil's servant, just like Sakura. That way, you and Sakura would be equals, and you wouldn't feel like you owe her anything."

"Wait... huh?" Rin tilted her head, her brain momentarily short-circuiting.

At first glance, it made sense, but something about it felt... off.

"Rin, if you do this, not only will you no longer feel indebted to Sakura, but you'll also be able to repay your past guilt. You've always treated Sakura well because you felt responsible for her being taken in by the Matou family. But no matter how kind you are to her, it never truly eases your conscience. Only an equal sacrifice will make you feel like you've truly made up for it. And now, with your mother's decision, the timing is perfect. Don't you think?" Saber took a sip of tea, her expression calm and composed.

"That... makes sense, but..." Rin hesitated.

Would the Saber from before have been so direct? Something still felt strange.

"Also, Saber, wouldn't this be letting that man off too easily?"

"Letting him off too easily?" Saber chuckled softly.

In her eyes, once this world had been carved out, there was no such thing as letting anyone off easily. This world would eventually belong to him—it was only a matter of time. Everything else was trivial.

"Rin, my suggestion is based on the assumption that you don't mind marrying him. After all, I feel the same way. I don't particularly care who I marry. But if you decide to find a partner on your own, you can simply ignore my advice."

"Really? You don't care either, Saber?" Rin mused, stroking her chin.

In that regard, Saber was just like her.

As Rin pondered, a soft, familiar voice reached her ears.

"So... this is how you feel, Big Sister?"

"Huh?" Rin's body stiffened. She turned slowly, her movements rigid.

Standing in the corner of the room was a girl with purple hair.

"Sakura?! How long have you been there?"

"I've been here since you said, 'Saber, you're the only one I can rely on,'" Sakura replied with a gentle smile.

"That means you've been here the whole time?!" Rin exclaimed.

"That's right. So, I heard everything you said, Big Sister~" Sakura's smile was sweet, but Rin couldn't help feeling a chill run down her spine.

"Rin, don't misunderstand. Saber was just giving me advice. I'm not trying to take anything from you," Rin quickly explained.

"Take something? I don't feel like you're taking anything from me, Big Sister," Sakura said, tilting her head innocently. She then tossed a jewel to Rin.

The jewel projected images of dimensional rifts appearing all over the world.

"Big Sister, do you know what this is?"

"Yes, it's a recent phenomenon of interdimensional invasions. But it seems the scale is far greater than I imagined," Rin replied honestly.

"That's right, Big Sister. The world is being invaded. The world is heading toward destruction. That's why I want you to become Akira's servant, just like me. That way, no matter what happens to the world, you'll be safe, and we can continue to live together. Big Sister, I believe this... would be a form of redemption for you. Your way of atoning."

"My... redemption?" Rin looked up at the sky.

Indeed, in the face of the world's impending destruction, what was the point of worrying about such things? Wasn't the most important thing for a family to live happily together? Survival was humanity's most basic instinct.

If I refuse to become a devil's servant and let the world be destroyed, Sakura would probably carry that guilt for the rest of her life. This is a necessary sacrifice to avoid that future.

In the end, faced with the world's crisis, Rin decided to stop overthinking and simply go with the flow.

Meanwhile, Akira had been busy helping people escape danger and meeting with individuals he had previously influenced.

For example, Claudia Hortensia, who had been saved from Kirei Kotomine's clutches thanks to Akira's intervention. And Caren, who had been born despite Akira's efforts to change her fate. Akira had to admit, the world's corrective force was strong. Even though Claudia had been saved, Kirei had simply found another wife, and Caren had been born regardless.

Of course, Akira's interference wasn't entirely in vain. With a different mother, Caren hadn't inherited the same cursed spiritual medium体质, freeing her from a life of exorcisms.

After traveling nearly the entire world, Akira finally arrived in the icy wilderness of Ireland.

There, he gave the last of his blessed crosses to a young woman with short crimson hair and a beauty mark under her left eye. Her name was Bazett Fraga McRemitz, a mage from an ancient Irish family.

Bazett had been sent to Fuyuki City by the Mage's Association to participate in the Fifth Holy Grail War. During the war, she had summoned Cu Chulainn, only to be betrayed by Kirei Kotomine, who stole her Command Seals.

Thanks to the world's consciousness gathering all its remaining energy to resist the system, Bazett had been granted her maximum potential. Both she and Kirei had gained Cu Chulainn's abilities. Since she was capable of defending herself, Akira had saved her for last.

"Bazett, hold out here for now. If things get too dangerous, use the cross I gave you," Akira said before spreading his wings.

"Understood. You're heading somewhere else, right?" Bazett replied, bowing slightly in respect.

"That's right. It's time to deal with the source of all this," Akira said before vanishing into the sky.

"Akira, huh? He sounds young," Bazett muttered, gazing at the sky.

As she thought about him, the cross in her hand began to glow. An image of a handsome young man appeared in her mind.

Bazett blinked in surprise. Even someone as stoic as her was taken aback by Akira's looks.

"Ah, I should've asked for his contact information," she sighed.

Then, she looked down at the cross in her hand.

"Wait... could this be used to contact him?" Bazett wondered.

After a moment of thought, she glanced toward the horizon.

"Maybe I should head to Fuyuki City. The Holy Grail... it's a disaster waiting to happen."

Meanwhile, Akira used his Leviathan abilities to travel to the edge of the world.

As soon as he arrived, a mechanical dragon appeared beside him. It was Machinedramon, who had followed Akira through their connection.

Akira, I've completed the task you assigned me. I've set up barriers around every dimensional rift to prevent outsiders from entering. Right now, your MarineDevimon is inside the barriers, fighting off the invading creatures. But even with its endless hunger, MarineDevimon is struggling. The enemy's numbers are infinite. We need to find a way to stop the world from collapsing, or MarineDevimon won't last much longer.

"I know. That's why I'm here," Akira replied.

So, you have a plan? Machinedramon asked, impressed as always by Akira's resourcefulness.

"Of course I do."

Akira nodded. At first, he hadn't had a clear solution, only the idea of using Machinedramon's awakened power to hold the line. But after visiting countless dimensional rifts and saving so many people, he had figured it out.

The solution was simple: he would use his innate abilities.

As a being with the blood of the high-dimensional Leviathan, Akira possessed the power of chaos and dimensions. The chaos power came from Leviathan, while the dimensional power was a result of his existence as a high-dimensional being.

Even if Akira had absorbed a different bloodline, he would have still awakened his dimensional abilities. The only question was whether he would have gained the power of chaos.

While traveling through the dimensional rifts, Akira's instincts had kicked in, revealing the solution to him.

All he needed to do was infuse the world with his dimensional energy. Just like how Ultraman Zett used his Zestium Beam to repair collapsing space, Akira could use his dimensional energy to fix the broken world.

Boost!

The Red Dragon Emperor's Gauntlet appeared on Akira's arm, and a terrifying aura surrounded him.

Welsh Dragon Balance Breaker!

Forbidden Move: Scale Mail!

As the Red Dragon Emperor's armor materialized, Akira's power surged to even greater heights.

But it still wasn't enough.

Even with the power of a high-class devil and his Balance Breaker, Akira hadn't reached the level of a Super Devil. To achieve that level of power, his base strength would need to be at least that of a Maou.

However, both Akira and Machinedramon knew that Balance Breaker was far from his limit.

The green jewel on the gauntlet began to glow with an emerald light as Akira's power continued to rise.

I—

Awaken as the Heavenly Dragon who seizes the truth of supremacy—

I laugh at the infinite, I cry for the dream—

I shall become the Crimson Dragon Emperor—and descend into the crimson purgatory!

Juggernaut Drive!

Note: So far this story is published up to chapter 125 on my patreon, go check it out and remember that if we reach the goal of 150 power stones I will publish the next chapter.