The ability of Perfect Memory.
This is a unique trait possessed by Index; not only can she clearly remember important people and events, but she also never forgets even the most trivial things, such as the faces of strangers passing by on the street or the minute veins on a green leaf.
"The human brain's capacity is surprisingly small, but it automatically organizes and discards unnecessary information, which is how humans are able to keep living. However, Index cannot do that."
Kanzaki Kaori stated the facts as she knew them, her head bowed as she spoke softly. Eighty-five percent of Index's brain is used to store 103,000 grimoires, leaving her with only 15% of her brain capacity available for normal use.
If this 15% capacity were to be continuously filled with memories, given the speed at which the Perfect Memory ability fills them, it would reach its limit in just one year.
"To protect Index, we use magic to erase her memories every year. The red-haired magician you defeated earlier and I were once friends by Index's side, but now, she has forgotten us."
At this point, Kanzaki Kaori, who had been looking down, couldn't help but grit her teeth. Emotionally stirred, she lifted her head to look at Kamijou Touma, placing one hand over her chest.
"You seem to view Stiyl as an enemy, but do you know what Stiyl's feelings... or my feelings are like? As long as we can protect Index, we are willing to do anything!"
Faced with Kanzaki Kaori's impassioned statement, Kamijou Touma was already in a daze, too shocked to process it. He truly had not expected such hidden circumstances to exist.
He clenched his fists, trembling. Although he felt the same way as Kanzaki Kaori and the others—that as long as Index could live, it didn't matter if he was forgotten.
But learning that Index had to have her memories erased year after year, that all her beautiful memories would vanish like bubbles in an instant—it was truly too cruel.
"Um, wait a second!"
In this sad and silent atmosphere, Chinatsu, standing to the side with dead fish eyes, slowly raised a hand. She opened her mouth and broke the silence with a single sentence, as if casting a spell.
Much like students raising their hands in class, Kamijou Touma and Kanzaki Kaori—those two not-so-bright teachers—cast confused glances toward Chinatsu.
In response, Chinatsu cleared her throat loudly. Although her store of knowledge was nothing compared to a true genius, among the trio present, she was undoubtedly the intellectual powerhouse by a landslide.
"Ahem! Although I don't know much about the magic or whatever you're talking about, while the Perfect Memory ability is a very rare trait, it isn't as mysterious as you make it out to be, right?"
Chinatsu raised a finger, turning the tables to become the teacher, and began a remedial lesson for the two students in front of her who were full of confusion and eager to listen.
Even if the Perfect Memory trait means one cannot forget any trivial detail, from a scientific theoretical perspective, the human brain would not simply overload because of it.
The amount of memory the human brain can store far exceeds the limits of a human lifespan. Furthermore, human memory is not of just one type; to facilitate storage, the human brain autonomously partitions different types of memories into different regions.
[Semantic Memory] [Procedural Memory] [Episodic Memory]
Analyzing it from the perspective of brain medicine, no matter how vast the knowledge stored, it is absolutely impossible for it to pressure the brain. The idea that 15% of memory capacity could only hold one year's worth of memories is complete nonsense.
"Yup, that's how it is!"
Chinatsu stated the facts as she understood them in simple terms. Kamijou Touma quickly reacted to this, while Kanzaki Kaori blinked blankly, giving the impression that she had just acquired some "strange new knowledge."
"The... the Church lied to us?"
Kanzaki Kaori murmured softly. The worldview she had known was gradually collapsing. If what Chinatsu said was true, then the Church had deceived her and Stiyl.
But why?
It is a fact that Index feels unwell every year when the expected time arrives, and it was precisely because we saw Index's pained expression that we firmly believed the Church's reasoning.
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