One Piece: Burning the Prison Clothes in the Setting Sun, Mihawk is dumbfounded.

This is not a fight to the death.

This is merely a test by two potential collaborators to gauge each other's aptitude for cooperation.

Of course, the main one is Aizen.

As for Dunn, he naturally understood Aizen very well, and he knew what Aizen wanted to do.

Even the most cunning schemer can be manipulated if they have something to gain.

Ding!

Aizen's sword struck Dunn's neck, but only produced a crisp metallic clang.

Aizen's sword was blocked by the thin skin on Dunn's neck; the blade couldn't even cut a little bit of skin.

Even someone as deep-thinking as Aizen couldn't help but show a hint of shock in his eyes at this moment.

Steel sheet?

This was Aizen's first thought.

Could it be that this Dunn is really some kind of Great Void?

Steel skin is a Hollow's ability. Some Hollows have extremely hard exteriors, so hard that even the blades of Shinigami cannot cut through them.

Of course, this does not include captain-level Grim Reapers.

But now, Aizen is very clear about how much force he used.

Aside from not using the power of Mirror Flower Water Moon, this strike was already his full strength in this state.

Dunn turned his head to look at Aizen.

Through the mask on Dunn's face, you can see his eyes, which have a playful look on them.

Aizen's heart tightened, and he withdrew.

"Put some effort into it, I can manage."

Dunn raised his hand and touched the spot where he had been slashed, and said with a smile.

Aizen: ...

That tone is so irritating!

"If this is all you've got, then I'm sorry, you're not qualified to work with me. In that case, all of you will have to stay here this time."

Upon hearing Dunn's words, Aizen glanced at the sword in his hand and a smile appeared on his face.

His smile grew wider and wider.

He took off his glasses and raised his hand to smooth his drooping hair.

Hairspray Hands is officially launched.

"Hahaha... How interesting, what an amazing ability."

Aizen's laughter stopped abruptly, and he suddenly looked directly at Dunn.

"I'm becoming increasingly curious about your power. This tough skin is incredible; it's like a rule, an indestructible rule."

Aizen looked at Dunn with fervent eyes.

"Good eye, but it's not very useful."

Dunn shook his head.

"Indeed, without proving myself, I am not qualified to discuss any cooperation with you."

Aizen agreed with Dunn's words.

"Therefore, I will do my utmost from now on, and I hope that Your Excellency will change your opinion of me."

As Aizen spoke, he held the sword horizontally in front of him.

Is it time for Bankai?

Seeing Aizen like this, Dunn's eyes lit up.

Come to think of it, he didn't even know what Aizen's Bankai was; he didn't seem to have seen it before he transmigrated.

boom!

An overwhelming pressure suddenly appeared.

The frenzied spiritual particles emitted sharp, explosive sounds in the surrounding space.

This is a phenomenon caused by the rapid movement of those restless spiritual particles.

And that is spiritual pressure.

Aizen, who was the main antagonist in the early stages, did not lose any fighting power in the later stages.

Even if Aizen's current strength is not as good as the Captain-Commander's, that's probably due to his Zanpakuto.

After all, the Captain-Commander's Zanpakuto is also known as the strongest Zanpakuto.

Now, Aizen is unleashing his full spiritual pressure.

"Yes, it's definitely not the same kind of power as domineering aura."

Feeling the powerful spiritual pressure on his body, Dunn commented.

If the spiritual pressure felt from the Hollows before wasn't very clear, the spiritual pressure emanating from Aizen now is very clear.

Conqueror's Haki is a unique power generated based on one's own aura.

In a sense, it can be considered a power of the mind or the power of the soul.

However, spiritual pressure is not. Spiritual pressure is a unique power generated by the resonance between the spiritual particles within one's own body and the spiritual particles in the outside world.

"call!"

Aizen's figure vanished instantly, appearing to Dunn's left, and he once again slashed horizontally at Dunn with his sword.

"Ding!"

Dunn raised his left hand, taking the blow with the back of his hand, and then moved sideways.

"I thought you'd use your Kido technique, but while this strike had enough power, its accuracy was lacking."

Dunn said with a smile.

Now he suddenly understood the way Hawkeye had looked at him back then.

The moves in this world are mostly wide and sweeping.

Or rather, the battles between Shinigami are a contest of spiritual pressure.

On the contrary, those fancy moves are not very useful.

For this reason, the swordsmanship in this world is even cruder than his.

Even Aizen, the main antagonist in the early stages, was in this situation.

Despite Dunn's provocative words, Aizen remained unmoved and vanished once more.

Then, with the burst of spiritual pressure beneath his feet, Aizen seemed to transform into dozens of people, unleashing a dense barrage of blade strikes towards Dunn.

Ding Ding Ding!

Dunn stood still, wielding his knife to deflect all the blades that came from all directions.

"If my friend were in this world, he would probably be very disappointed."

While parrying Aizen's attacks, Dunn remarked with considerable emotion.

"This world?"

Aizen's attack suddenly paused, and then stopped.

"Are you referring to Hueco Mundo? Or to the world we live in?"

Aizen looked at Dunn, seemingly wanting to get an answer from him.

"Well...maybe you'll find out later."

Dunn smiled, his eyes behind the mask looking at Aizen.

Swish!

Dunn's figure appeared directly in front of Dunn.

Dunn, who was a head taller than Aizen, looked down at Aizen.

"You were curious before, weren't you? You felt that my power was similar to someone else's."

Dunn's words caused Aizen's expression to shift.

boom!

Flames erupted directly, and the terrifying heat distorted the surrounding space.

Like a volcanic eruption, Aizen could only retreat and avoid the impact.

"Hmm, let me think what it was again... Oh, right, the Blazing Blade - West - Sunset Prison Robe!"

Dunn's voice rang out.

Aizen's eyes widened involuntarily.

Then, the flames that erupted in front of him seemed to come alive, shrinking towards the center.

Then, Dunn stood there, as if he were draped in a cloak of flames.

Just looking at it makes my eyes feel like they're being burned.

The space around Dunn collapsed and then recovered under the terrifying heat, as if the world around Dunn was an illusion.

Does this look familiar?

Dunn, gripping the knife, cracked his knives and asked with a smile.

"Where did you learn about this, sir?"

Aizen was shocked that Dunn used such a method, but he was even more shocked that Dunn actually imitated it.

Because the Captain-Commander hasn't made a move in a very, very long time.

Naturally, no one has seen such a move in a very long time.

And Dunn, did he meet the commander-in-chief a long time ago?

Is this person an ancient monster from long ago?

If that's the explanation, then Dunn's strength becomes somewhat understandable.

But that's all Aizen thought, because Dunn, from any perspective, didn't fit that idea at all.