He was helpless about this.
This was not his specialty. The research on spatial manipulation in Hueco Mundo was incredibly complex, which greatly delayed his analysis progress. He had no better solution and could only solve it gradually.
"Ten years?" Unohana frowned. "We don't have ten years. Can't we hurry this up?" Her voice remained calm, but her eyes betrayed her growing concern.
Mayuri replied proudly, "With Urahara's talent, it would take more than ten years to complete this research. But I don't need that long. My talent exceeds his, so I can complete it much faster." He straightened his posture, his golden teeth gleaming as he smirked.
With these materials as reference, he truly didn't need ten years to open a new Garganta to Karakura Town. The challenge was that it would be somewhat unstable with limited capacity. He estimated only one or two people could pass through.
"So, how long will it take you?" Unohana's expression remained unchanged, but in her heart, she already had a bad feeling.
Mayuri said confidently, "Three days!"
"No, we don't have that much time to waste!" Unohana replied decisively. "I'll give you three hours!"
"Impossible, absolutely impossible! Unless..." Mayuri was left speechless, his painted face contorting with frustration.
Isane, who stood beside them, asked curiously, "Unless what?"
"Only that guy Shiroha could do this," Mayuri admitted helplessly.
Though he didn't want to acknowledge it, the facts proved that even in terms of technological research and development, Shiroha was far superior to him, the captain of the Twelfth Division.
It was one thing that Shiroha could overpower them in combat, but his spatial technology was equally impressive, which left Mayuri completely frustrated. After all, Shiroha could enter and exit Hueco Mundo at will without attracting anyone's attention. The combined resources of the Department of Research and Development couldn't accomplish this. They could only admit defeat.
After hearing Mayuri's words, Isane was shocked. Unohana showed an expression of "as expected" and nodded.
"Captain Kurotsuchi, please continue your research! I will contact Commander Uehara."
Meanwhile, in the fake Karakura Town!
Three Espada-level Hollows emerged from the Garganta with their subordinates, releasing powerful Reiatsu that seemed to distort the very air around them.
Facing three Espada-level Arrancars and the Aizen trio simultaneously, the Shinigami present, including the captains, felt immense pressure.
"This is trouble," Kyōraku observed, quickly assessing the situation. "Aizen's Kyōka Suigetsu is perfectly suited for this battlefield. Every Arrancar is formidable and poses a significant threat. With Kyōka Suigetsu controlling our five senses, that threat increases exponentially. We must neutralize it, or we have no chance of victory." He adjusted his straw hat, his usual playful demeanor replaced by serious focus.
However, the most unsolvable aspect of Kyōka Suigetsu was that once affected, you could never escape its influence.
The other Shinigami realized this too, worry evident in their eyes. With Aizen present, none dared act hastily. Since everyone had been exposed to Kyōka Suigetsu, they risked striking their own allies. Worse, they wouldn't know if they were about to be ambushed.
In close-quarter combat, Kyōka Suigetsu was virtually invincible. At this critical moment, they needed the strongest Shinigami—Yamamoto Genryūsai Shigekuni.
Facing Aizen and his group of Espada-level Arrancar, Captain-Commander Yamamoto said nothing. He simply gripped the cane in his hand and declared:
"Reduce all creation to ash, Ryūjin Jakka!"
Scorching flames erupted with terrifying heat and overwhelming Reiatsu. In an instant, the wooden cane shattered into pieces and turned to ash, revealing the zanpakutō hidden within—Ryūjin Jakka, the god of flame!
The moment the zanpakutō was revealed, it had already released its Shikai. The terrifying power of the strongest and oldest fire-type zanpakutō was fully unleashed. Within seconds, all moisture in the air evaporated. The horrifying high-temperature flames danced wildly, consuming and destroying everything in their path.
Heat waves rippled outward, incinerating everything they touched.
Faced with these sudden, terrifying flames, everyone present tensed, thinking to themselves: "He released his Shikai immediately. The strongest Shinigami isn't holding back."
But this wasn't the end. Yamamoto swung Ryūjin Jakka and commanded, "Jōkaku Enjō!"
BOOM!
With a deafening explosion, several pillars of flame shot skyward, surrounding Aizen and his two companions, forming an impenetrable fiery cage.
The blazing walls acted as a barrier, dividing the battlefield in two and trapping Aizen's group inside. Every Shinigami and Arrancar present felt the deadly threat emanating from those flames.
Even the Hierro of an Espada-level Arrancar couldn't withstand such heat. Attempting to break through would result in being reduced to charcoal at best—or ashes for the weaker ones.
In terms of raw destructive power, Ryūjin Jakka was simply overwhelming—much like Kyōka Suigetsu, both were unmatched in their domains.
Seeing this development, even Aizen's pupils contracted momentarily before he regained his composure. Everything was proceeding according to plan. As long as Shiroha didn't join the battle, all would be well.
Therefore, facing the blazing fire cage, Aizen smiled with characteristic calmness. Gin and Tōsen were already using their Reiatsu as shields.
Even though they were only indirectly affected, the blood in their bodies still reacted to the extreme heat. An uncontrollable burning sensation spread throughout their systems.
Both realized their Reiatsu and physical strength had decreased to varying degrees. This was merely from being indirectly affected by Ryūjin Jakka.
The strongest fire-type zanpakutō truly lived up to its reputation.
"Lord Aizen, it seems we cannot break through this wall of fire," Gin observed, glancing at the fiery barrier surrounding them and shaking his head helplessly. "Ryūjin Jakka is terrifying. What should we do now?" His fox-like smile remained, but sweat beaded on his forehead from the intense heat.
The temperature of these flames was absurdly high. Even captains like themselves would be incinerated instantly if they attempted to breach the fiery wall.
It was his first time witnessing Yamamoto unleash Ryūjin Jakka's full Shikai power. Everyone knew Ryūjin Jakka was formidable, but they hadn't expected this level of strength.
Its Shikai alone surpassed many captains' Bankai. He couldn't imagine how powerful Ryūjin Jakka's Bankai might be—likely capable of reducing all captains to ash with a single strike.
Only monsters like Shiroha and Aizen could contend with Ryūjin Jakka's Bankai. Aizen's chances were questionable, but Shiroha would definitely prevail.
Aizen responded calmly, "These flames are difficult to extinguish through ordinary means. They're quite troublesome to encounter. Although forcing our way through is possible, it would consume significant Reiatsu and physical strength. For now, we should wait and observe. Have faith in the Espada!"