In DxD with Sign-In System!

Just then, a rainbow-colored card appeared before me, radiating a brilliant light.

"System, how do I use this?"

After examining the card carefully, I asked the system.

My heart was pounding with excitement, and my voice trembled slightly.

[The host needs only to lightly touch the card with their finger to open the gift bag.]

Even though the system's mechanical voice was devoid of emotion, to me it sounded like the most beautiful music in the world.

Suppressing my excitement, I slowly extended my trembling right hand, and my finger lightly touched the rainbow-colored card.

Suddenly, the card emitted a blinding light that scattered in all directions. A figure flew out from the card and soared into the sky above Kuoh Town.

When the light faded, a giant dragon's phantom, radiating an aura of pure terror, appeared before me.

"Ding! Congratulations to the host for opening the Rainbow-Grade Gift Bag and obtaining the soul of one of the Four Symbols, the Azure Dragon!

(Its World Dragon Kurma From Mondaiji-tachi)

(On VS Battles Wiki, it is classified as a 2-C Multiversal Being!)

Note: The Azure Dragon is more powerful than Kouryuu, one of the Seven Great Demon Kings of the Little Garden who possesses the power of a True Dragon! Due to the host's current weakness, it can only be used once for a short time. The duration of use and the power it can exert will change along with the host's own strength."

The system's voice had barely faded, and I was already completely stunned!

...

...

From what I understood, the Little Garden had a vast worldview, but there were very few beings in the double-digit ranks! The exact power level of a single-universe entity was unknown, but in this world, they were absolutely invincible!!

In front of the Azure Dragon, The True Red Dragon God Emperor, wouldn't even be worth mentioning.

[Host, do you wish to merge with the soul of the Azure Dragon?]

The system's mechanical voice interrupted my thoughts, bringing my attention back to the Azure Dragon's phantom in the sky above Kuoh Town.

"System, merge me with the Azure Dragon's soul."

I didn't think twice. I immediately told the system to merge me with the Azure Dragon's soul. My eyes were glued to the giant dragon's phantom above.

[Ding! Dragon soul fusion beginning…]

As the system's voice sounded, the dragon's phantom emitted a brilliant beam of light that instantly enveloped me.

As the Azure Dragon's soul merged with me, I could clearly feel my life essence undergoing a sublimation, an evolution. But what I didn't know was that the outside world was undergoing earth-shattering changes.

The Azure Dragon's phantom spanned the entire DxD world. No matter where you were, you could clearly see the Azure Dragon's phantom.

Even the Great Red, soaring through the Dimensional Gap, could clearly sense the intimidating power of the dragon's phantom. He was utterly astonished.

A being more powerful than a double-digit from Little Garden. The Azure Dragon. Just a tiny bit of its power leaking out was enough to make the entire world tremble, as if it were about to shatter.

Because of this, even the Great Red had to use his own power to stabilize the world.

And the Fallen Angels and Devils residing in Kuoh Town wore expressions of absolute horror!

"What the hell is going on?"

Rias Gremory, stared blankly at the dragon's phantom in the sky. She could clearly feel the fear emanating from the depths of her soul.

Her best friend, Sona Sitri, along with their peerages, felt the same way.

Their faces were pale, their pupils constricted, and they were filled with terror as if they were about to die at any moment.

As high-ranking Devils, they had seen many Dragon Kings. They hadn't seen the two Dragon Gods, but at least they'd heard about them. However, the dragon's phantom in the sky was unlike any dragon they knew. It was as if it had appeared out of thin air. It was all too surreal.

These two Maou's sisters wanted to quickly relay the information to their families, but the pressure on their souls made them unable to move.

...

At this moment, the Four Great Maou in the Underworld were also staring at the sky in terror.

"What is this? This dragon's phantom's power completely surpasses that of a Dragon God."

They could clearly feel that, with the appearance of this dragon's phantom, they were like weak ants. Even their internal magic power had stopped circulating.

As one of the few remaining Super Devils in the Underworld, Maou Lucifer understood that even facing the Infinite Dragon God wouldn't cause such a feeling of powerlessness.

But in the face of this dragon's phantom, he couldn't muster a single thought of resistance, because this dragon's phantom could definitely erase him with a single thought.

....

It wasn't just the Underworld. Even the main gods of the various pantheons, such as those in Hell, the Greek pantheon, and the Norse pantheon, were staring at the dragon's phantom in astonishment.

And, of course, the various Dragon races were reacting, too. The current Five Great Dragon Kings, the evil dragons, the Red Dragon Emperor and the White Dragon Emperor, looked at the dragon's phantom in the sky with reverence in their hearts. Their power was on a completely different level from that of the phantom.

Just then, the Azure Dragon's soul completely merged with me.

The Azure Dragon's soul suddenly let out a dragon's roar that made the powerhouses of the various pantheons cough up blood.

Then, the dragon's phantom disappeared from the sky above Kuoh Town. The main gods of the various pantheons all looked towards Kuoh Town with grim expressions. They then issued a series of orders, their intentions unknown.

For example, the originally troublemaking Indra sent a message to Cao Cao, asking him to maintain a low profile recently.

In a certain unknown location, a silver-haired loli appeared. It was none other than the infinitely cute Dragon God, Ophis. She stared blankly at the sky and muttered.

"A strange Dragon God whose power far surpasses mine and the Great Red's… I wonder if you can help me reclaim my silence?"