After sharing the information about the 'Voice of Hell', Saitō Furōfushi told Sora about some of her experiences in Hell.
"How did you leave Hell back then, Miss Saitō? You can enter when the 'Gate of Hell' opens, but leaving shouldn't be so easy, right?" Sora asked.
"I was quite lucky at the time. I didn't have to wait long before a 'Gate of Hell' appeared in the World of the Living, so I left directly through it," Saitō Furōfushi explained. "There's a big difference between someone like me, who entered Hell voluntarily, and those who fall into Hell after death. They are restricted by Hell and cannot actively pass through the 'Gate of Hell', whereas I can pass through it freely."
If Sora wanted to enter Hell, he could also do so when the 'Gate of Hell' opened.
But Hell is vast, and the location where the 'Gate of Hell' opens within it is not fixed. If one is unlucky, they might not encounter a gate for a very long time and be unable to leave.
"Hm? What's this snack? It's delicious!" Saitō Furōfushi's slightly tipsy and hazy eyes suddenly lit up.
"This is shumai. It's a snack I made myself," Sora said with a smile.
"You made it? You actually have such cooking skills!" Saitō Furōfushi was very surprised. She picked up another piece of shumai and put it in her mouth, a satisfied smile instantly appearing on her face. "It's called shumai...? It's so fragrant!"
"I'm glad you like it, Miss Saitō. I made a lot of shumai, enough for several meals. They can be stored in a reishi space for a long time, so you can enjoy them slowly." Sora remembered something and continued to ask, "By the way, the 'Voice of Hell' is your bridge to communicate with your grandmother. It should be very important to you, right? Why would you use it as a prize for a duel with Batsu'unsai?"
"The 'Voice of Hell' can be used to communicate with people in Hell because my grandmother inscribed a Kidō formula on it. I later learned how to make it from her through the 'Voice of Hell'. Even without it, I can make a new one." Saitō Furōfushi's face suddenly turned red. What she didn't say was that she had been on a losing streak and, in a fit of desperation, had put up the 'Voice of Hell' as a wager.
"A Kidō formula that can communicate with the dead in Hell?" Sora's interest was piqued. "Miss Saitō, could you teach me how to make a 'Voice of Hell'?"
"You want to learn this?" A sly smile appeared on Saitō Furōfushi's face. "This is not within the scope of our exchange!"
"Naturally. Miss Saitō can propose other terms," Sora nodded lightly.
"Let me think..." Saitō Furōfushi stroked her chin, shaking her head. "Knowledge of Kidō formulas is very precious! For the next hundred years, if you bring me a meal of snacks and fine wine no less exquisite than today's each year, I'll teach you!"
"Once a year... so a hundred times... I agree to this exchange." Sora felt this frequency was acceptable. Although the 'Muken' was heavily guarded, it wasn't too difficult for him to enter. The biggest difficulty was that he might forget about it.
"Great! Then first go and prepare the remains of a spiritual organism with a spiral structure, like a large conch shell. This formula needs to be inscribed on such an object to work." Saitō Furōfushi was very satisfied with this deal, unable to suppress the smile on her face. She had just been worried that she had said too much and that no one would come to see her anymore.
"A large conch shell..." Sora frowned. The Soul Society was all landlocked, with no oceans, so things like large conch shells didn't exist.
The World of the Living has large conches, but things there are made of kishi and cannot be brought to the Soul Society.
The Soul Society did not yet have the technology to convert kishi objects into reishi objects.
"Would the remains of a Hollow work?" Sora asked.
A spiral-structured object didn't have to be a large conch. Hollows were not limited to a humanoid form; many small animal-like Hollows in Hueco Mundo had shells, making it easy to find one with a spiral structure.
"It should work... I think?" Saitō Furōfushi wasn't sure herself. "I've never tried it. The 'Voice of Hell' my grandmother gave me was made from the shell of a creature from Hell. There shouldn't be a problem if we use a Hollow's shell."
"Alright, I will go to Hueco Mundo to find such a shell." Sora nodded. "Then I shall take my leave for now."
"You're leaving already..." Saitō Furōfushi was a bit reluctant to see him go. It had been too long since she had spoken with anyone from outside Muken.
"I will bring snacks and fine wine next time. Goodbye, Miss Saitō." After bidding her farewell, Sora left Muken.
This time, Sora had obtained a great deal of information related to Hell from Saitō Furōfushi.
Sora wanted to learn the Kidō formula from Saitō Furōfushi mainly to communicate with her grandmother in Hell.
Although the formula she possessed could be used to communicate with people in Hell, using it could also lead to passively receiving other information, making one susceptible to the mind-influencing power within Hell.
Using it carried a certain risk. The person who stole the 'Voice of Hell' was highly likely to have been influenced by this power and controlled by the will of Hell.
After leaving Muken, Sora returned directly to his laboratory.
Only Aizen Sōsuke was in the lab, operating a set of instruments.
"Professor, the reishi detection device you gave me has been optimized."
Aizen Sōsuke stood up to show Katori Sora the optimized device:
"I mainly optimized the collection module. It can now directly analyze the residual reishi in the atmosphere and compare it with the data in the database."
"I think the data comparison module can also be optimized. The speed of data comparison could be increased significantly, but unfortunately, time was short, and I haven't finished optimizing this module yet."
"This is already very good. This way, we can even lock down the Reigai's range of activity, which will greatly increase the speed at which Captain Kyōraku and the others can search for them." Sora nodded in appreciation.
Aizen Sōsuke had also heard Sora talk about encountering the 'Gate of Hell' in the Rukongai, so he knew that the need to optimize the reishi detection device was urgent.
"Have all the reishi data stored in the device been extracted?" Sora asked.
"They have been extracted." Aizen Sōsuke hesitated to speak.
He had also discovered the astonishing similarity between his professor's reishi and his grand-master's. The similarity was even greater than that between a mother and son related by blood!
It had even reached the standard for identifying a Reigai!
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