After copying every Longinus, Izumi immediately began equipping the girls around him.
Rias Gremory received the Boosted Gear, the Sacred Gear of the Red Dragon Emperor.
Himejima Akeno received Kankara Naraku, the lightning-based Longinus known as Brilliance of Heaven's Thunder Prison.
Asia Argento received the Sephiroth Graal, the legendary Holy Grail of the Underworld.
Avrora received Absolute Demise, the Eternal Ice Princess.
Katō Megumi received Dimension Lost, the Longinus that manipulates absolute mist.
Sawamura Eriri Spencer received Annihilation Maker, also known as Black Blade Dog God.
And the rest—
Almost every girl around Izumi was given a Longinus-class Sacred Gear.
Watching this outrageous display, the original Sacred Gear users were completely stunned.
But Izumi wasn't finished yet.
After equipping those around him, he began arming his little army of girls.
The Red Dragon Emperor Squad.
The White Dragon Emperor Squad.
One after another, entire units of Longinus users were forcibly assembled by Izumi.
The strength of these girls skyrocketed instantly.
They had all reached S-Class combat levels.
An S-Class army.
And not just a few—
There were a terrifying number of them.
The scene was so unreasonable that no one even knew who they should complain to.
And that wasn't all.
Izumi continued equipping the girls with all kinds of Noble Phantasms and divine artifacts.
It could be said that he had armed them to the teeth.
After creating and distributing so many powerful artifacts, even Izumi began to feel tired.
It was a rare sensation.
How long had it been since he last felt fatigue?
After finishing everything, Izumi finally allowed himself to rest.
All preparations were complete.
The only thing left—
Was to launch the final assault on the EXE World.
...
Meanwhile, the human world began mobilizing its forces once more.
Aside from a small number of people remaining behind, almost every combat-capable individual was sent to the frontlines.
At the same time, news spread across the world.
They were preparing to launch a full-scale invasion of the EXE World.
The reaction from humanity was overwhelmingly supportive.
Just as Izumi had once said—
Why should they only endure being invaded?
Why shouldn't they invade their enemies in return?
Izumi's proposal to attack the EXE World gained massive approval.
His name quickly spread across the entire planet.
Originally, Izumi had already become famous after leading the defense of the Fourth Gate with zero casualties.
Now he was preparing to lead the entire world in a counterattack.
His reputation reached unprecedented heights.
With no internal conflicts left, the entire world moved as one.
Troops and supplies were continuously transported to the four dimensional gates.
Since this battle would not be fought on their own soil, logistics were critically important.
Everything had to be prepared perfectly before the invasion could begin.
For nearly an entire month, resources were transported non-stop.
Izumi even personally constructed several warships to help carry supplies.
Thanks to that, the enormous logistical effort was completed within just one month.
Once everything was ready—
Izumi finally began preparations for the assault.
...
On the day after the supplies arrived—
Alarms rang throughout the Fourth Gate.
Combat personnel rushed toward the central assembly plaza.
Izumi floated in the sky, watching the soldiers gather below.
Once everyone had arrived, he finally spoke.
"I won't waste time with long speeches."
"The battle ahead may cost you your lives."
"I cannot promise that you will survive the battlefield."
His voice echoed across the plaza.
"But I can promise one thing."
"If this war succeeds—"
"Your families will live their lives without worry."
"They will receive full support, benefits, and compensation."
Izumi continued speaking, explaining the guarantees and rewards that had been prepared.
Hearing those assurances, many soldiers felt their doubts disappear.
After all—
Many of them were only children.
Knowing that their families would be taken care of allowed them to fight without hesitation.
Seeing the determined atmosphere, Izumi nodded in satisfaction.
Then he raised his hand toward the dimensional gate leading to the EXE World.
With a single motion—
He tore open a much larger opening in the passage.
"Move out."
As soon as he said those words, Izumi charged forward into the dimensional rift.
Le Fay, Rias, and the others followed immediately behind him.
Seeing their leaders advance without hesitation, the soldiers clenched their fists.
With the resolve to face death—
They stepped onto the terrifying battlefield.
At the same time, the forces stationed at the other three gates also launched their invasions.
The counteroffensive had officially begun.
...
Izumi led the charge.
The moment they entered the EXE World—
A massive mechanical city appeared before them.
The entire city was filled with countless robotic soldiers.
The moment Izumi tore open the dimensional gate, the city's defense systems activated.
As Izumi stepped inside, a barrage of attacks immediately rushed toward him.
But Izumi had already anticipated this.
That was exactly why he entered first.
With a wave of his hand, the space before him stretched infinitely.
A massive geometric cube appeared in the void above.
Then it slammed down toward the city below.
BOOM!
Imaginary Cube.
It was an ability Izumi had obtained after merging with the Herrscher of the Void core.
Until now, he had rarely used it.
But this time, he unleashed it at full power.
In an instant—
More than half the city was crushed beneath the overwhelming spatial pressure.
With just a single attack, the heavily fortified city was suppressed.
Then Izumi rose into the sky and spread his arms.
Countless black holes appeared in the air.
In the next moment—
Endless streams of energy rained down on the city.
Now that the invasion had begun, Izumi had no reason to hold back.
He attacked with his full power.
And it wasn't just him.
At the other gates, the strongest warriors of the DxD world also unleashed devastating attacks the moment they arrived.
Sirzechs Lucifer released his Power of Destruction, instantly wiping out the defenders guarding the entrance.
Most of the EXE World's main forces had been sent to assist Regalzeva.
Very little powerful military strength remained here.
After all—
They had never imagined that the DxD world would invade their dimension instead.
...
However—
Regalzeva learned about the invasion the moment Izumi entered the EXE World.
Within this world, he possessed countless surveillance systems.
Every movement was reported to him immediately.
Especially the four dimensional gates used to invade the DxD world.
Regalzeva stared at the report in disbelief.
"How dare they?!"
His voice was filled with fury.
For countless years, they had always been the ones invading other worlds.
Yet now—
Someone had dared to invade their world instead.
And because of his moment of carelessness, the people of the DxD world had already captured several key gateways.
Not only Regalzeva—
Even his younger brother Melvazoa was furious.
They had ruled this world for countless years.
They had invaded countless dimensions.
But this—
This was the first time they had encountered enemies so brazen.