The Rating Game was set for three days later, leaving a few days for everyone to train properly.
To improve everyone's strength, Rias decided to have them all train hard and enhance their abilities.
When it came to improving strength, Rias immediately thought of Tachibana Koneko. This child had become so powerful only under Inaba Tsukiyo's guidance. If they also trained with Inaba Tsukiyo, could they also improve their strength?
With this thought, Rias brought the other members of the Occult Research Club to the Inaba Household and explained her intentions to Inaba Tsukiyo.
Having her train four people at once… even Inaba Tsukiyo found it very taxing, but it wasn't an insurmountable problem.
As per usual, Inaba Tsukiyo set the training location in the Imaginary Space.
"This… this… is this an alternate dimension?"
Rias, visiting for the first time, widened her eyes, unable to suppress her inner shock, and exclaimed.
Although the Devils, Fallen Angels, and Gods all possessed tools and techniques to create alternate dimensions, and even the upcoming game would be held in an alternate dimension,
no one had ever been able to create their own alternate dimension as freely as Inaba Tsukiyo.
The sensation under her feet constantly told Rias that everything before her was real, not an illusion created by the environment.
"This isn't an alternate dimension, Rias. This place is the Imaginary Space."
Inaba Tsukiyo explained. She didn't know what Rias meant by an alternate dimension, but this was the Imaginary Space, not just any alternate dimension.
"Imaginary Space?"
Everyone looked puzzled. They had never heard of the Imaginary Space; this term was not deeply integrated into this world's vocabulary.
"Hmm~ How should I explain it to you? Since you're studying at a human school, you should at least know about the two solutions in the wave equation of quantum physics, right?"
Rias and the others nodded. Although they were Devils, they were also very proficient in human knowledge. While quantum physics might be a bit advanced, they still knew about the two solutions to the wave equation.
Knowing this basic concept made the following explanation much easier.
"One of the two solutions is a real number solution, representing reality. The other is an imaginary number solution, representing the unknown. Generally speaking, the imaginary solution has no meaning, but there is also a theory that an Imaginary Space might exist, a space that humans cannot comprehend. The imaginary solution represents this space."
This was the first time Inaba Tsukiyo had explained the existence of the Imaginary Space to outsiders. Even Tachibana Koneko and Himejima Akeno, who had been there many times, were captivated by this unknown knowledge.
(fuhai: It's not the science that attracted them, but the unknown world of the Imaginary Space.)
"The world we live in is a four-dimensional space, referring to three dimensions plus time. It is also called Real Space. Opposite to it is this Imaginary Space you see."
"Wait a minute! Tsukuyo. If, according to you, the world we live in is a Real Space with three dimensions plus time, then this Imaginary Space would be..."
Himejima Akeno exclaimed in shock, having thought of a certain possibility. Originally, she thought this was just another type of alternate dimension, but after grasping the general concept of the Imaginary Space, a sense of shock continuously spread.
Not only Himejima Akeno, but the others also gradually understood the meaning represented by the Imaginary Space, looking at Inaba Tsukiyo in surprise.
Inaba Tsukiyo wanted to see their surprised looks, like country youths entering a city for the first time, feeling full of superiority.
"You're right, Himejima Akeno. Unlike Real Space, which has length, width, height, and time flow, none of these exist in the Imaginary Space. It can be infinitely large or infinitely small. There is no time here; every instant is eternity!"
"If Real Space is a line, where time is the direction of the line and space is its composition, then Imaginary Space is like a point—a point with no size and no direction."
Inaba Tsukiyo broadly explained the meaning of the Imaginary Space to everyone, but the amount of information was simply too vast, and Rias and the others couldn't process it yet.
It turned out that such a wondrous place existed in areas they were unaware of; the Imaginary Space was not just a hypothetical concept.
"But… whether human or even Devil, no one has any understanding of the Imaginary Space. Before I knew this was the Imaginary Space, I always thought it was an alternate dimension."
Himejima Akeno asked, puzzled. She believed that besides Devils, even Fallen Angels and Gods had no understanding of the Imaginary Space.
Like a blank slate, even if they wanted to understand the secrets of the Imaginary Space, there was no method of exploration, because for them, the Imaginary Space was merely a concept.
"Yes. According to your statement, the Imaginary Space and Real Space are antithetical, which also means that the Imaginary Space and Real Space are disconnected. With humanity's current technological level, they shouldn't be able to find a way to connect the two worlds, right?"
"Please be careful with your wording, Rias. It's not that they can't find a way to connect the two worlds, but that they can't even find the node that links the two spaces."
Inaba Tsukiyo said with a smile. Her words made Rias and the others begin to re-evaluate Inaba Tsukiyo.
Since humans haven't yet found a way to connect the nodes of the two spaces, why is Inaba Tsukiyo able to move freely between them, as if… as if her very existence were the key to opening the two spaces?
Rias was right. The Second Herrscher—Herrscher of the Void, as the Herrscher of Space, her ability was like a key to open two spaces, and she could directly connect the Imaginary Space and Real Space.
She could transfer things from Real Space to Imaginary Space, and also release them from Imaginary Space, thereby achieving spatial transfer of objects.
She could also use the energy of the Imaginary Space to distort Real Space, projecting non-existent things, and even using the passage between the two realms as a barrier for defense.
During the Second Honkai Eruption war, the reason humanity paid such a heavy price was precisely because humanity knew too little about the Imaginary Space and too little about space itself.
"What's wrong? What are you all thinking about? I just told you the principles of the Imaginary Space, why have you all become like this? My purpose in bringing you here was for you to train properly."
Inaba Tsukiyo interrupted their thoughts and began to consider how to arrange their training.
Tachibana Koneko and Kiba Yuuto were easy to deal with; just let the Heavenly Father and Mikazuki Munechika train them. But Rias, Himejima Akeno, and Asia were a bit troublesome.
Inaba Tsukiyo could personally train Rias and Himejima Akeno, but Asia was very difficult, as she herself was not proficient in healing abilities.
However… this was not an unsolvable problem. With a small price, she could find the best teachers for them.
Suddenly, Inaba Tsukiyo spread her arms, like a conductor of an orchestra, waving her hands continuously.
As Inaba Tsukiyo's hands began to move, Rias and the others felt the ground beneath their feet begin to tremble. The ground instantly split into several pieces, with one person standing on each cracked block.
"President!"
"Tsukuyo!"
Everyone was caught off guard by the sudden events. Just as they thought of jumping to another member's block, an immense gravity suddenly pressed down, making them completely unable to move.
"Don't worry, I'm just assigning each of you a suitable training ground. Your suitable teachers will arrive soon, please wait a moment."
After saying that, Inaba Tsukiyo waved her hand, and the blocks flew off in different directions at an extremely fast speed.
In this infinitely vast Imaginary Space, as long as one flies in one direction, they will eventually land. What's more, she had specially prepared a safe landing spot for everyone.
"Since they've all been sent off, now is the time to allocate tasks. We need to use this power now. Honestly, I wonder what expressions they'll have when they see these people."
As soon as she finished speaking, a portal opened beside Inaba Tsukiyo, and Mikazuki Munechika and the Heavenly Father walked out.
Sitting down in place, Inaba Tsukiyo calmed her mind, and the shadow behind her began to stretch continuously. From within the shadow, five clones of Inaba Tsukiyo emerged.
After these shadows climbed out from within the Imaginary Space, the clones looked at each other, glanced at the rings in their hands, and then closed their eyes.
Each clone radiated dazzling light, and when the light dissipated, each clone had transformed into a different person.
"This is... I never expected such a method could be used to summon us. You really have some ideas, Tsukuyo."
A white-haired girl in red clothing said, her gaze fixed on Inaba Tsukiyo from the moment she appeared.
"After all, each clone can only inherit a limited amount of the Original Body's power. In order to maximize our power, she chose to let the Original Body sleep and inject all of her power into the clones. What a bold idea. Is she not worried that we might secretly do something while she is asleep?"
"Alright, everyone. Since Master wants us to guide those people, it means she trusts us. Please do not disappoint Master's trust."
"Understood, guide. Honestly, changing classes seems to have completely changed her. Although she's not as crazy, her personality is really unbearable."
"Honestly, I'm just a scientist. Why am I being made a teacher? I've never had students before. Does she misunderstand my identity? To make me teach others to fight?"
"Alright. We don't know how long we'll exist this time, so let's first check the aptitude of the people we're going to guide. Hahaha~ Devils? How very interesting."
The red-haired girl laughed heartily a few times, then turned and walked into the portal that had opened beside her.
The others followed her example, walking into the portal as well.
The club members, who had been assigned to different areas, simultaneously discovered a portal appearing in their respective areas, and an unfamiliar person emerged from within.
"You are...?"
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