Starting as a pirate, he rose to become the strongest Shinigami in Soul Society.

Chapter 508 There really is a Yotsukai!

"Your Zanpakuto is too terrifying. No wonder the Spirit Lord forbade you to use it recklessly," Kisuke Urahara remarked.

"I've even told you about the weaknesses and how to counter them, and you still find it scary?" Aizen said with a sneer.

"There are probably only a handful of people in Soul Society who could touch your blade after being hit by it. I'm definitely not one of them, so saying this is pointless. Besides, this is only your Shikai. Who knows what kind of monstrous Bankai you'll be?" Kisuke Urahara rolled his eyes, but didn't dwell on it too much. He stepped forward, knocked down the Hollow material, and began the sealing process.

"I've openly told you about the weaknesses of my Zanpakuto and how to counter them, and you still want to covet my Bankai? So, greed is the original sin." Aizen teased with a chuckle.

"You really haven't told anyone about Bankai? Not even Lord Spirit?" Kisuke Urahara couldn't help but ask while dealing with the Hollow.

In his memory, Aizen was very "loyal" to Bane. Apart from the things he did in private, he would answer whatever Bane asked.

As for whether Aizen will use Bankai?

To be honest, anyone who knows him even a little bit would not have such doubts.

Orochimaru, Kisuke Urahara, Mayuri Kurotsuchi, Robin, Hiyori Sarugaki, Shinji Hirako, and others all unanimously believed that Aizen had secretly attained Bankai a long time ago, at some unknown time.

However, until now, none of them know what Aizen's Bankai is, but considering how terrifying Kyoka Suigetsu is, it must be ridiculously powerful!

Upon hearing this question, Aizen's expression faltered slightly. After a moment, he sighed softly and said, "No, nobody knows."

After a slight pause, Aizen continued, "When I reached the Bankai stage, I went to find my teacher immediately. However, at that time, I was already hesitant about whether to tell my teacher about my Bankai ability. My teacher seemed to see my hesitation and said something to me that I still remember to this day."

"What did you say?" Kisuke Urahara stopped what he was doing and looked at Aizen with great curiosity.

"A disciple need not be inferior to his master, nor a master necessarily superior to his disciple. Aizen, I can see that you intend to use this power as a surprise on me at some point in the future, right? If that's the case, then I look forward to the day when I can savor your Bankai. So there's no need to say anything more." Aizen repeated Bane's words verbatim.

After listening, Kisuke Urahara fell silent. After a long while, he couldn't help but sigh, "The Spirit Lord is truly admirable."

"A disciple need not be inferior to his master, nor a master necessarily superior to his disciple. My master clearly hopes that one day I can surpass him. Although it seems like a difficult goal to achieve, it gives me even more motivation. To fulfill his wish, I will not stop moving forward." Aizen said with a firm and powerful tone.

"Alright, alright, I know the bond between you two is very strong, I don't want to hear it anymore, come and help." Kisuke Urahara had already used a special bandage to bind the Hollow Mask into the shape of a mummy, and beckoned to Aizen.

Seeing this, Aizen didn't continue the previous topic. He quickly composed himself and softly chanted, "The mystery of the black coffin, the suffering of the black cavity, black."

After several chants, a small, enclosed space appeared. Urahara Kisuke threw the Arrancar Hollow inside, then clapped his hands and asked, "Shall we continue?"

"Not for now. Let's capture a few Hollows for experiments and then head back." Aizen calculated the time and felt that the Eighth Division's intelligence gathering work should be almost over.

If we continue like this, it might arouse suspicion from Kyoraku Shunsui and the others when we get back. If they ask us about it, we'll have to figure out how to cover it up. There's no need for that.

Meanwhile, in Soul Society, Seireitei.

The deepest part of the 12th Division's underground research lab, the 12th floor.

That's right. So many years have passed, and Orochimaru, as the captain, has not been idle. He has at least tripled the size of the original Technology Development Bureau's research institute.

The original underground structure has been expanded to the twelfth floor.

In the dark corridor on the twelfth floor, Hiyori Sarugaki, dressed in a Shinigami uniform with a vice-captain's armband on her arm, held a metal chain in her hand and kept pulling a bound prisoner forward from behind her.

"Hurry up, you piece of trash!" Hiyori Sarugaki shouted, pulling on the chain.

As if sensing some great terror ahead, the prisoner's hands, feet, and mouth were restrained, preventing him from struggling too much or uttering any words. He simply squeaked and refused to move forward.

Enraged, Hiyori Sarugaki walked up behind the prisoner, jumped up, and kicked him in the waist, sending him flying dozens of meters before he crashed into a metal wall at a distant corner.

"You bastard, a piece of trash like you who would harm your own comrades should have been executed on the spot. Now we're giving you a chance to offer your useful body as a test subject. You should feel honored!" Hiyori Sarugaki cursed.

Perhaps because her movements were a bit too vigorous, and because her shihachi (a type of Japanese martial arts) outfit was very loose, a necklace hanging around her neck swung off.

Upon discovering this, Hiyori Sarugaki quickly tucked the necklace back into her shihaka, tightened her collar, and said cautiously, "I can't just let this get out."

If anyone had seen it earlier, they would have noticed that what was hanging on the necklace wasn't some precious gemstone or other ornament, but rather an ordinary-looking nameplate with the character "heart" written on it.

That was a secret society founded more than fifty years ago by Aizen Sousuke, Urahara Kisuke, Robin, Mayuri Kurotsuchi, and Orochimaru.

Its name is "Isshin-kai" and its members are generally people related to the Spirit Lord's faction. After so many years of development, this secret society, Isshin-kai, has spread to many aspects of Seireitei.

It could even be described as unbelievable.

That is the current third seat of the sixth division, Kuchiki Byakuya, the 28th head of the Kuchiki family, who is a member of the Isshin-kai!

Kuchiki Byakuya is a bit outrageous. He is a high-ranking nobleman of the Kuchiki family and the next head of the family. I don't know how he ended up in the Isshin-kai.

The member who recommended him to join was Uchiha Sasuke. That's right, these two guys have a very good relationship. How good? So good that Uchiha Sasuke and Kuchiki Byakuya forged an extremely deep friendship while working together on the follow-up matters of the Pure Land development, to the point that Byakuya even joined the Isshinkai. How good can their relationship be? Almost to the end!

Aside from Byakuya, many other members of the Isshinkai hold high positions of power.

Members of the Isshinkai include Hirako Shinji, captain of the 5th Division; Fubuki, vice-captain of the 7th Division; Tessai Wakishi, the great master of the Kido Clan; and Souya Azashiro, who was immediately selected as vice-captain of the 3rd Division after being released from prison.

Fifty years is but a fleeting moment for the Grim Reapers. It may sound like a long time, but in reality, the Yixin Society has only just begun. Members believe that the Yixin Society will continue to expand and attract more outstanding talents in the future.

"Vice-Captain Hiyori, don't be so violent. What if you break our test subject?" Mayuri Kurotsuchi seemed to have heard something and walked out of a laboratory on the other side of the corner. Looking at the prisoner sliding down the wall, she revealed a cruel smile.

Beside Mayuri Kurotsuchi was a little girl who didn't even reach his waist. That was Nemu Kurotsuchi, the most outstanding artificial Shinigami created by Mayuri Kurotsuchi, who combined the technology of Kiryu Hikifune with the support and help of Aizen Sousuke, Urahara Kisuke, Orochimaru and others.

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Seeing how sensible and obedient Nemu was, without Nemu needing to say anything, she took small, quick steps and ran to the prisoner's side. As if possessing immense strength, she grabbed the tall, adult Shinigami, raised him above her head with one hand, and looked at Nemu, saying, "Lord Nemu, shall we send him to the laboratory?"

"Okay, go ahead." Mayuri Kurotsuchi nodded in response.

Without saying a word, Nie Yinmeng picked up the thing and ran towards the laboratory.

Mayuri Kurotsuchi then looked at Hiyori Sarugaki and said, "The Soul Reaper's Hollowfication technology has reached a critical moment. The Hogyoku's appetite is becoming increasingly terrifying, but it's still not perfect enough. To make it a complete Hogyoku, it needs a large number of Soul Reaper souls. Can you think of any other solutions?"

"I've already extradited all the death row inmates and hardened criminals from Kensei's prison, so there probably won't be many more after that," Hiyori Sarugaki said, shaking her head.

After a slight pause, she continued, "Didn't you use artificial souls before? Why are you suddenly in such high demand for Death God souls?"

"That final gap can never be filled with an artificial soul," Mayuri Kurotsuchi said with a hint of helplessness.

"This is troublesome," Hiyori Sarugaki muttered, then, as if remembering something, glared fiercely at Mayuri Kurotsuchi and said, "Even if we can't make up for it for now, you absolutely cannot harm innocent people, otherwise, we will definitely not let you off the hook!!!"

"If I had done that, we wouldn't be in this stalemate now," Mayuri Kurotsuchi sneered.

Although the Yixin Association is a unified entity, many of its members have differing ideas and viewpoints.

For example, Hiyori Sarugaki and Shinji Hirako have "normal values." They are willing to help Isshinkai members develop within their capabilities, but they will never cross their own bottom line.

In contrast, Orochimaru, Mayuri Kurotsuchi, and others are at the other extreme. If no one is watching them, the two of them could definitely cause a lot of trouble.

After a moment of silence, Hiyori Sarugaki finally softened her tone and said, "I'll mention the situation here to Soya and Byakuya, and see if they can help fill the gap."

"Using those filthy and lowly scum who, because of their noble status, can greatly evade judgment? That's a good idea." Upon hearing this, Mayuri Kurotsuchi's eyes lit up, and she nodded with a smile.

After a slight pause, Mayuri Kurotsuchi continued, "Actually, it would be great if we could infiltrate the Second Division. That good-for-nothing Kisuke Urahara, if he could just pull Yoruichi Shihouin into the Isshin-kai, then those dangerous elements imprisoned in the maggot's nest could be put to use."

This guy has absolutely no moral conscience and never considered that if it weren't for Bane and Orochimaru's influence, he might still be in prison in the Maggot's Nest if things had gone according to the original story.

"Yoruichi-senpai is too impulsive. She's not suitable to join Isshin-kai. She might expose our existence. Let's think this through more carefully," Hiyori Sarugaki commented, shaking her head.

(End of this chapter)