One Piece - Heaven Defying Comprehension!

Chapter 1: Heaven-Defying Comprehension – Ittō Kasō! 

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"My child, please hold on a little longer. Soon, very soon, you will be born..."

Ace heard a gentle whisper beside his ear. With effort, he opened his eyes and saw warm water surrounding him.

"This... What is this..."

Ace wanted to speak, but found he couldn't make a sound at all. As he shifted his gaze slightly, he was startled to realize he had been reborn as an unborn baby!

"My child, your father is Roger. As his son, you can endure this, can't you? Just hold on a little longer; soon, you will be born."

The soft whispers continued to fill his ears, and Ace's heart trembled.

Roger? As in The Pirate King Gol D. Roger?! The world of One Piece?!

Had he traveled through time and become Ace, the same name as he had in his previous life?

The one speaking softly now must be his mother in this life, Portgas D. Rouge. To avoid the Marines hunting for Roger's bloodline, Rouge, who was meant to be pregnant for ten months, held on for twenty, eventually dying in childbirth.

No wonder he was already fully developed yet not born. He had become Fire Fist Ace of the One Piece world!

Ace pondered this silently, recalling Ace's life story in his mind. 

With the Logia-type Flame-Flame Fruit, he possessed the natural power of Conqueror's Haki and had the qualifications to become the king of the seas. But because he hated the bloodline of his biological father, Gol D. Roger, he restrained his potential.

Ultimately, during the Summit War, he died to Akainu's magma fist. All he could think was how tragic it was.

Ace's Flame-Flame Fruit abilities, when he first appeared, had amazed many in his previous life. Unfortunately, as the One Piece world developed, it seemed like everyone had fire abilities, diminishing the once-mighty Logia power.

The once-powerful Flame-Flame Fruit was now so ridiculed it was said not even a dog would eat it!

Combined with Ace's somewhat naïve mindset, he never fully developed his Conqueror's Haki and lacked the ambition of a king. His downfall was inevitable.

When it comes to fire abilities, the strongest should be Yamamoto Genryusai Shigekuni, Captain of the Gotei 13 in the world of Bleach. His flame techniques are said to reach the core temperature of the sun, earning him the title of the strongest Shinigami in a thousand years!

Particularly, during his battle with Aizen, even with his Zanpakutō, Ryūjin Jakka, sealed, he could still use the forbidden technique Hadō No. 96: "Ittō Kasō" (Flame Sword Burial). That towering blade of flames was the true embodiment of fire.

Ace thought silently...

"Woosh!"

As these thoughts filled his mind, his vision suddenly darkened, and the next second, the warm ocean environment was replaced by a ruined cityscape. He found himself lying in a crater amid the ruins.

"I won't ask you to live, Yamamoto Genryusai. Your life is the history of the Seireitei, and your fate is to die by my sword," a cold, emotionless voice echoed in Ace's ears.

Ace struggled to lift his gaze and saw a man in white, sword in hand, walking toward him.

"Aizen?!"

That familiar face and attire sent shockwaves through Ace. But before he could react, his right hand instinctively grabbed Aizen's foot.

"Boy, don't make me repeat myself," an elderly but vigorous voice issued from Ace's mouth.

Dark red cracks began to form on his already charred arm!

Aizen's eyes trembled slightly.

"This… this is the Forbidden Technique, a spell that ignites one's own body... Hadō No. 96..."

Aizen's pupils shrank suddenly.

"Flame Sword Burial!!!"

"Boom!!!"

With a furious roar, a storm of flames erupted from the burnt remains. A terrifying blaze surged up like a towering blade of fire!

The intense heat distorted and fractured the very air around them. The world seemed ready to be consumed by the terrifying flames.

The colossal fire blade rose as if piercing the heavens, a symbol of the strongest Flame King in existence!

"Woosh!"

The scene shattered in an instant, and Ace returned to the familiar warm waters.

"Your comprehension is heaven-defying. Through visualization, you have grasped it firsthand and developed your exclusive technique – Flame Sword Burial!"

"Your heaven-defying comprehension, combined with the whispers of Portgas D. Rouge, has enabled you to completely master the language of the One Piece world."

A flood of new information appeared in Ace's mind, startling him with its sudden clarity!