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Red Dragon Emperor With The Villain System!

Zaelum
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Synopsis
Transmigrating into the DxD world, Sai Akuto awakened the Villainous Protagonist System. As long as he acts in ways befitting a villainous protagonist, he earns system rewards. Starting as the Red Dragon Emperor, Akuto steps onto the path of a villainous protagonist. Amano Yuuma: “Who just kisses someone right after they confess? And worse, I couldn’t even resist!” Rias: “Akuto is the boldest man I’ve ever met… he actually dared to sl*ep with me right in front of Grayfia.” ... Traveling through countless anime worlds, Akuto gathers retainers one by one, step by step building his own dimensional empire. Miyamoto Rei: “He didn’t even hesitate—just blew Houji’s head apart. I straight up pissed myself on the spot.” Akame: “What do you mean you ‘have a way’ to keep Esdeath off the battlefield for ten months?” Erica: “Never have I seen such shamelessness! The Witch of Sardinia gave him an inch and he climbed straight onto the bed.” Minamiya Natsuki: “The hell?! How did all the Blood Companions meant for the Fourth Progenitor, Nagisa, get stolen by you?!” ... DxD, Highschool of the Dead, Akame ga Kill, Campione, Strike the Blood, Jobless Reincarnation, Eminence in Shadow, Date A Live, Danmachi… Each world arc won’t drag on too long.
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Chapter 1 - Chapter 1

Kuoh Academy. Second Year, Class B.

Back row by the window, the homeland of kings.

During class, Sai Akuto was lying on his desk, fast asleep.

The teacher clearly noticed Akuto sleeping, but made no attempt to wake him.

Sleeping in class without interruption—this was Akuto's privilege as the top student of the grade.

Perhaps because it was uncomfortable to sleep slumped on his desk, Akuto did something unusual—he dreamed.

In his dream, he recalled the breathtaking scene he witnessed after school yesterday.

The setting sun dipped low, and a beautiful girl with flowing crimson hair opened the white window of the old school building.

Red—so red.

That crimson blazed like fresh blood, dazzling beneath the golden sunset, shimmering with noble scarlet-gold radiance.

The breeze caressed her refined, noble features, lifting her long hair, as though the entire scene were a painting.

"Rias-senpai is the kind of woman who could become my girlfriend."

"As a man, I should find a girlfriend as beautiful as Rias-senpai."

Before such a supreme beauty, Akuto displayed the same ambition any MC with plot armor.

Why choose between 'a true man should be like this' and 'he is fit to be replaced'?

He wanted both!

Perhaps his desire was too simple and direct.

Right after he voiced that thought, a mechanical voice echoed in his mind.

[Ding!]

[Host's willpower purity detected. System initializing...]

[Congratulations. Host has awakened the Villainous Protagonist System. As long as the host commits deeds befitting a villainous protagonist or completes villainous missions assigned by the system, rewards will be granted!]

[Ding!]

[Artifact detected: "Boosted Gear." The Red Dragon Emperor's consciousness has been erased. System is correcting weaknesses and unsealing permissions.]

[Weakness Corrections: ① Dragon weakness removed. ② Power doubling occurs every 10 seconds and automatically stores, no longer needing retreat to accumulate. ③ Past Red Dragon Emperors' souls crystallized separately—using "Boost" will not be influenced by them. ④...]

[Permission Unseal: As long as artifact development progresses, host may freely use Balance Breaker, Juggernaut Drive, and the Red Dragon Emperor's origin power.]

[Ding! Generating novice reward based on host's situation...]

[Ding!]

[Congratulations. Host receives Novice Reward: One Free Juggernaut Drive Usage.]

[One Free Juggernaut Drive Usage: As the name implies, host may activate Juggernaut Drive once, without condition, without injury.

To the Red Dragon Emperor, Juggernaut Drive is the ultimate forbidden move. Its activation conditions are strict, requiring immense artifact mastery, and its backlash severe.

Yet its power is terrifying—enough to slay gods.

The ability to use it once freely allows the host to face nearly any danger calmly.]

As the system chimes faded, Akuto's mind drowned in chaos. A flood of fragmented memories struck his brain.

His past life?

He was… a transmigrator?

"System? And these memories…!"

Akuto jolted awake, lifting his head sharply to stare at the podium.

The oppressive force of his gaze made the teacher falter mid-lecture.

"Sai-kun… what's wrong? Was my voice too loud and disturbed your rest?"

"No, nothing at all. Please continue your lecture."

No longer able to sleep, Akuto turned his gaze to the cherry blossoms outside the window.

While enjoying the scenery, he organized the flood of information in his mind.

"So it's like this… I actually transmigrated into the DxD world?"

"This world is filled with both extreme danger and extreme opportunity. Thankfully, the system's novice reward gave me the foundation to survive."

"In thirty years, this world will be invaded by the ExE world. Even beings like the True Red Dragon God Emperor will face death."

If only to survive that catastrophe thirty years from now, he had no choice but to grow stronger.

As class drew to its end, Akuto pondered his next moves.

Should he become a servant of Rias or Sona?

Sona treated her servants well, Rias even spoiled hers. But in the eyes of high-ranking devils, servants were either dogs or property.

Without the system, becoming a servant might have been reasonable. But now? With the system in hand, becoming someone else's dog? Laughable.

What? Being a servant grants early protection? Makes it easier to pick up girls?

Akuto scoffed. He already had protection.

As for girls—if he could only rely on proximity to chase them, he might as well be struck dead by fate the moment he stepped outside.

"Of course, that doesn't mean I won't build good relations with Rias and Sona."

After all, Akuto had his eyes not only on them, but on all their beautiful female servants as well.

"Ding-dong-deng-dong~ dong-ding-ding-dong~"

The dismissal bell rang.

At the same moment, the system prompt chimed.

[Ding!]

[Congratulations, host has triggered a Story Mission—Amano Yuuma's Confession.]

[Mission Rank: Green (Ranks: Green, Blue, Purple, Gold, Red, Rainbow).]

[Mission Description: The Fallen Angels' Sacred Gear detection technology is advanced. Even if the host's Sacred Gear had not awakened, they would still have detected it.

Now, Amano Yuuma has been tasked with investigating the host and is preparing to act.]

[Mission Requirement: Accept Amano Yuuma's confession in a way different from the original storyline.]

"Hm? A system mission?"

"But isn't this requirement too simple? Just accept her confession?"

Wasn't this free?

He already planned on accepting Amano Yuuma's confession.

[Ding~]

[As the host of the Villainous Protagonist System, please act differently from the original protagonist whenever possible, altering the flow of the world.]

[If you accept her confession as the original did, villain index will be low, and even green-rank rewards may degrade to white.]

"I see… so the system actually has this much freedom?"

Akuto quickly packed his bag, preparing to leave.

If he was right, Amano Yuuma was already waiting at the school gate.

But before leaving, a brown-haired, bespectacled beauty flashed him a playful smile.

"Yo~ Sai-kun, looking good today~"

"Right now, you're a whole centimeter longer than you were this morning."

Her name was Kiryu Aika—the infamous pervert and data-master from the original story.

If the protagonist's best friend could tell a girl's cup size with one glance, she could measure a boy's length and girth at a glance!

"Not only length increased by a centimeter, diameter too—0.3 cm. Sai-kun… your condition is extraordinary today~~~"

Aika covered her lips with a teasing smile, brazenly flirting.

Normally, Akuto would've just smiled bitterly and shaken his head.

But now—awakened memories, awakened system—Akuto would only flirt back!

"My condition is good today. What's wrong, Kiryu-san? Do you want to taste for yourself?"

"Eh? T-taste for myself?"

For the first time, Aika froze.

Could she? Was he serious?

No, no—something was off. Why would Sai-kun suddenly say something so bold? Did he snap? Lose control?

Should she… help him? Or maybe find someone else to?

Akuto was more than satisfied with her flustered reaction.

Pervert? Please—she was just a clueless maiden putting on airs.

"If you're not interested, Kiryu-san, I'll take my leave."

He slung his bag over his shoulder and strode out of the classroom, leaving Kiryu Aika questioning her very existence.

(End of Chapter)

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