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

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Saber gave up.

Akira smiled as he watched Saber.

After Saber let out a sigh, he heard the system's notification.

[Ding!]

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

[Check-in Level: Gold.]

[Check-in Type: Event Check-in.]

[Check-in Event: The Defeat of the King of Knights.]

[Requirement: Defeat Saber in a direct confrontation, making her lose the will to resist.]

[Congratulations, host, for receiving the reward: Fate Shuttle!]

[Fate Shuttle: A time-space shuttle powered by fate. Each time it performs a time-space jump, it requires a certain amount of fate as fuel.]

[For male characters, their fate can be used as fuel by voluntarily relinquishing all their power.]

[For female characters, their fate can be used as fuel by absorbing it through the high-dimensional succubus bloodline.]

[After paying the price, the user can travel back to a major event in the timeline of the person who paid the price, achieving a certain degree of historical change.]

[Note: Only minor historical changes can be made. Major events cannot be altered. Even if significant changes are made, the world's correction force will revert the timeline to its original state. Apart from the host, only one additional person can be brought along per jump.]

The Fate Shuttle, powered by fate, could travel through time and space?

Akira glanced at Saber.

No wonder this machine was extracted from Saber. It seemed capable of fulfilling Saber's lifelong wish.

However...

The condition for activating the Fate Shuttle was to use the high-dimensional succubus bloodline to absorb all of a female character's fate.

How could he convince Saber to pay the price before receiving the reward?

While Akira was deep in thought, Kiritsugu Emiya took the initiative to sit down.

"Akira, you've shown your power."

"If I'm not mistaken, the reason you did this was to propose a collaboration, right?"

"Collaboration... that's not urgent."

"There are some things I need to clarify before we formally collaborate," Akira replied after some thought.

"What things?" Kiritsugu asked calmly, sipping his tea.

"Kiritsugu, and Saber as well, let me explain the nature of this world."

Akira extended his hand, projecting a screen in front of him.

This was an extension of his Balance Breaker ability, allowing him to project what he had seen directly.

"Let me reintroduce myself."

"My name is Akira, Akira Leviathan."

"Leviathan? I recall that's the name of a demon king from hell..." Kiritsugu's expression shifted slightly.

Was Akira a demon king?

A demon king who could command a Twelve-Winged Fallen Angel and a being almost on par with it, like Agumon?

This was beyond wild.

"Correct, Leviathan is a demon king from hell."

"The original Leviathan is dead, and I am his successor."

Akira nodded.

"Since I was young, I've had a special ability to observe other worlds."

"And this is part of the result of my observations."

"Without my interference, this world would likely follow this path."

Akira waved his hand, and the screen displayed the events of Fate/Zero.

"The Holy Grail War continued... until only you and Kirei Kotomine remained."

"Saber fought against Gilgamesh, while you fought Kirei."

"When the Grail was activated, you realized it had been corrupted and chose to destroy it."

"The black mud from the Grail fell, causing massive destruction."

"However, compared to the destruction of the world, this was relatively minor."

"I've observed Holy Grail Wars far more intense than this one."

Akira casually played some clips from other Holy Grail Wars.

Although they weren't complete, Kiritsugu could tell how intense the battles were just from the snippets.

"After my intervention, some people's fates changed."

"In the original timeline, Tokiomi Tohsaka's wife, Aoi Tohsaka, would have died. But now..."

Seeing Kiritsugu and Saber's expressions shift, Akira continued.

"Similarly, Sakura Matou's original fate was to be thrown into the worm pit by the Matou family's old worm, becoming a breeding ground for worms. Ten years later, she would become a Master in the next Holy Grail War."

"Illya's original fate was to never reunite with her parents, growing resentful and participating in the next Holy Grail War, only to die at the hands of Gilgamesh."

"So, the memories in our minds are the result of your interference?" Kiritsugu asked solemnly.

How laughable.

This world was so pitiful that even falling into the hands of a demon king was better than its original fate.

"So, what is your goal?" Kiritsugu's gaze sharpened as he looked at Akira.

It was well-known that demons would deceive their contractors through indirect means.

However, demons could also grant wishes.

And Kiritsugu... truly had a wish he was willing to make a deal with a demon for!

"My goal?"

Akira smiled pleasantly.

"When I was young, my power wasn't enough to let me travel to other worlds."

"Now that I have the power, I naturally want to fulfill some of my long-held desires."

"That is... to take possession of the beings from other worlds that interest me."

"Have you ever watched anime or movies?"

"Have you ever wanted to enter those worlds and change the story to your liking?"

"That's exactly what I'm doing now."

"I see..."

Kiritsugu nodded.

He understood now. Akira was a collector, and this world was his latest acquisition.

While nodding, he made a decision.

"In that case, I want to make a deal with you."

"Do I... have the qualifications to make a deal with you?"

Kiritsugu asked knowingly.

If he didn't have the qualifications, Akira wouldn't have shown him all this.

"Of course, you have the qualifications."

"I'm just curious, what price are you willing to pay? And what wish do you want to make?"

Kiritsugu remained silent for a long time, as if organizing his thoughts.

After half a minute, he spoke.

"I hope you can end the Holy Grail War with minimal damage, destroy the Grail, and prevent the black mud from spilling out."

"As for the price..."

"Whether it's Irisviel, Saber, or even Maiya, I don't care..."

"Huh?"

Saber raised an eyebrow.

Why could she be part of Kiritsugu's price?

Even if she were to sell herself, shouldn't she be the one to decide that?!

After hearing Kiritsugu's wish, Akira raised an eyebrow and smiled.

Kiritsugu was indeed Kiritsugu, always thinking of others as bargaining chips.

However—Akira refused.

"Mr. Emiya, do you think too highly of me?"

"Can what you're offering really be considered a price?"

"Let's not even discuss whether you have the right to make decisions for Saber, or whether I have any interest in Maiya."

"Just talking about Irisviel..."

"Since when has Irisviel Einzbern become your bargaining chip?"

"You only have the right to beg me to save Irisviel's life, not to use her as a bargaining chip to demand something from me, don't you think?"

Akira coldly retorted.

"So... the deal is off?"

Kiritsugu sighed.

As expected, demons were not easy to deal with.

They might seem friendly on the surface, but when it came to making deals, they would never take a loss.

"No, Mr. Emiya, you misunderstand. I haven't given up on making a deal with you."

"I just... want to change the price."

"Change the price? To what?" Kiritsugu became even more alert.

"I want... all of your abilities, or rather, your fate."

"What do you mean by... my fate?" Kiritsugu didn't quite understand.

"Alright, as a special service to facilitate the deal, let me explain."

Akira stood up and began pacing slowly.

"Fate is the focus of the world's attention."

"The reason I can observe you participants of the Holy Grail War, and the reason you retain memories of the future even after the world's will was expelled, is because... you possess this world's fate."

"Those who possess fate will remain strong until their destined time comes. No matter what happens, they will overcome adversity and rise again."

"However, once the destined time arrives, even those with fate cannot resist the call of destiny. They will inevitably meet their end."

"For example, Kiritsugu Emiya."

"Your fate is to participate in the Fourth Holy Grail War, become one of the last two Masters, and order Saber to destroy the Grail."

"Because you are not fated to participate in the Fifth Holy Grail War."

"Even if you weren't severely injured, you wouldn't live to see the next Holy Grail War ten years later."

Kiritsugu fell silent.

He had now seen the contents of two timelines.

The first timeline was the one Akira had altered, leading to the future ten years later.

The second timeline was the original one, where Kiritsugu had been severely injured and died before the next Holy Grail War.

Even in the first timeline, where he wasn't injured, he rapidly weakened and died just before the Fifth Holy Grail War.

He had been puzzled by this, but now he finally understood the reason.

"Is there any way to change fate?" Kiritsugu's voice grew hoarser.

"Yes."

"Haven't I already shown you?" Akira smiled faintly.

"You mean... your direct intervention is required?" Kiritsugu's eyes gradually lit up with understanding.

"Correct."

"Only an existence from outside the world can change fate."

"Only someone with a strong enough fate can change the fate of those with weaker fates."

"Both are necessary."

Akira's knowledge about "fate" came partly from the system, partly from Agumon, and partly from the Fate Shuttle.

Since the conditions for the Fate Shuttle to perform a time jump were strict, to prevent the host from wasting resources, the system provided detailed explanations about what kind of fate could be used as fuel.

"If I'm not mistaken, collecting fate is also very beneficial for you, right?" Kiritsugu flicked the ash off his cigarette and pressed further.

"It's beneficial, but not overwhelmingly so."

Previously, the only benefit was absorbing fate through the high-dimensional succubus bloodline to increase power.

But now, there was an additional benefit: the ability to travel through time, albeit with strict conditions.

"So, you helped Illya because..." Kiritsugu's gaze sharpened.

"Partly, yes. But personally, I quite like Illya."

"Even if I couldn't obtain her fate, I would still save her just to satisfy my own desires and collecting habits."

"To satisfy your desires and collecting habits..."

Kiritsugu shook his head. Demons were indeed demons, always so straightforward.

"So, Kiritsugu Emiya."

"Now that you know all this, you should be able to make a decision, right?"

"Deal? Or no deal?"

"You've seen the events of this world and know my personality. You should understand that I won't force you."

"Because I'm a demon. Before signing a contract, I must confirm the contractor's willingness." Akira smiled.

"Demons... truly are despicable creatures," Kiritsugu commented neutrally.

"Indeed, demons are despicable. But they are also very real." Akira shrugged.

"Alright."

"Before answering this question..."

"You said you wanted all of my abilities and fate."

"The magic crest I inherited from my father—does that count as part of my abilities?"

"If not, I'd like to transfer the magic crest to someone else first. It's a symbol of the mark I've left on this world."

After a few seconds of silence, Akira checked the Fate Shuttle's instructions and gave his approval.

"Sure, you can transfer the magic crest first."

"Good."

"Then there's nothing more to discuss. Let's sign the contract!"

"My request remains the same. The price will be changed to my abilities and fate!"

"The contract can be signed now, but I still need to retain my contract with Saber to complete some things I must do!"

"Then... let's celebrate our successful collaboration in advance?"

Akira snapped his fingers, and a contract fell from the air.

It was only in the Fate/Zero world, where everyone's fate was so tragic, that this method could work.

In other worlds...

Note: So far this story is published up to chapter 110 on my patreon go take a look and remember if you reach 70 stones of power I will publish the next chapter.