A Scientific Urban Detective.

Chapter 598 Complete Memory
Index lives up to her name, and is also known as the "A Certain Magical Index" because the knowledge of 130,000 grimoires is recorded in her mind.

According to the information provided by Stiyl, in order to store 130,000 grimoires, 85% of Index's brain has been permanently occupied.

Only 15% of her memory capacity is left for her daily life.

For a person with "complete memory ability", this memory capacity is obviously not enough because there is no "forgetting" mechanism.

Therefore, in order to ensure Index's survival and prevent her brain from being overwhelmed by excessive memory information, the only way, provided that the 130,000 grimoires could not be touched, was to manually delete her memory on a regular basis - 15% of her daily life.

Specifically, it must be deleted once a year.

This is also the reason why Index does not recognize Stiyl and Kanzaki Kaori, who are obviously her companions - because her previous memories have been deleted.

Moreover, the real mission of Stiyl and Kanzaki Kaori coming to Academy City this time is to hold an annual ceremony - to erase Index's memories of the past year.

This morning, while Kamijou Touma was out looking for a phone to contact Lin Wuming, Stiyl intercepted him while he was alone. Because of his injured legs, Kamijou Touma could only move slowly with crutches and there was no way he could escape.

Taking advantage of the opportunity when Kamijou Touma was temporarily separated from Index, Stiyl told him the whole truth.

Although he was unwilling, Stiyl finally accepted Kamijou Touma's resolution, so he chose to tell him the truth.

However, after hearing that Index would have to erase her memories of the past year in less than a week, Kamijou Touma could never accept this outcome.

Although Kamijou Touma was frightened by unfamiliar concepts such as "magic" and "magic book", he felt a little confused.

But he was still a modern teenager who grew up in a normal society and studied in Academy City. After hearing Stiyl's explanation, Kamijou Touma instinctively felt that something was wrong.

Or rather, it is unwillingness.

Kamijou Touma firmly believes that just because a magician cannot solve a problem, it doesn't mean that scientists cannot solve it either.

Since Index was facing a problem with her brain memory, Kamijou Touma naturally thought of one of the Level 5s in Academy City, the "Psychological Master" Queen Bee of Tokiwadai!

Coincidentally, Kamijou Touma and Lin Wuming are very familiar with each other, so it is even easier to find Shokuhou Misaki through Lin Wuming.

Hence the current phone call.

Although Stiyl was wary of "mind control", since they were just communicating over the phone, he didn't have to worry about Shokuhou Misaki taking the opportunity to do something to Index, so he acquiesced to the call.

However, what Kamijou Touma didn't expect was that neither Shokuhou Misaki nor Lin Wuming spoke, but it was Misaka Mikoto who started complaining first.

"What, are you talking about a brain teaser?" Misaka Mikoto tried to maintain her image a little, "Uh, Kamijou...senpai?"

"I'm seriously seeking expert guidance, Your Highness. Please get the Queen on the phone!"

"But the expert is very angry now." Misaka Mikoto glanced at Shokuhou Misaki beside her.

"Huh? Why?"

"That's why I called it a brain teaser. Asking an expert this kind of question would definitely be considered a prank, right?" Misaka Mikoto said. "A year's worth of memories takes up 6.6% of the brain's memory capacity. Simply put, even without that so-called grimoire taking up memory, % of the capacity would only hold years of memories."

"But Index has perfect memory, she never forgets a single piece of information..." Misaka Mikoto rolled her eyes. "Perfect memory, also known as 'hyperthymesia,' is rare, but it's not uncommon. Just look it up online, and you'll find that it's not uncommon for people with hyperthymesia to live to old age and die of natural causes."

"Huh? Oh, yeah." Kamijou Touma seemed to react and understood what Misaka Mikoto meant by "brain teasers".

It's a very simple elementary school math problem, and you can see the flaw with just a casual calculation.

"And after all, the human brain isn't a computer," Shokuhou Misaki finally spoke. "How can it have such a rigid percentage capacity... Listen, even if the brain is damaged and only one-tenth of the brain tissue remains, people can still live normally and even obtain doctorates—there are such cases. So, forget your ridiculous percentage theory!"

“Huh?” Kamijou Touma exclaimed, “Did you hear that, Fire Mage? You’ve been tricked. Index can be saved!”

"So, Queen," Kamijou Touma asked earnestly, "could you please come and see? How can we save Index?"

"Since it's not a memory or brain issue, there's no point in looking for them, right?" Shokuhou Misaki said. "Besides, the magicians don't seem to want anyone to touch their Forbidden Index."

Looking up, I saw Kamiya Kaoru looking at me with a complicated expression.

"So... what were we doing before?" Kamiya Kaoru was shaken for a moment, but then regained her composure. "Sorry, Mr. Lin Wuming, I have to leave first!"

After saying this, the female saint picked up the sword on the ground and walked away at a speed that ordinary people could not understand.

"Kamijo Touma, how are you doing over there?" Lin Wuming asked. "Pay attention, a female magician is also rushing over here."

“Huh? There’s another magician?” Kamijou Touma asked in surprise. “But don’t worry, my fire magician also suddenly left. They should have gone to meet up somewhere else, right?”

Feeling that the misunderstanding had been resolved, Kamijou Touma no longer had any hostility towards Stiyl, and even optimistically believed that they could become companions.

After all, they all have the same goal - to help and save Index and make her happy.

But soon, the cold reality hit him hard.

"Kamijo Touma, there are less than seven days left until this year's ceremony."

Not long after, the fire magician Stiyl and another beautiful girl with a long sword reappeared in front of Kamijou Touma; then, they threw such a cold reality in Kamijou Touma's face.

“Huh?” Kamijou Touma didn’t react for a moment.

"In other words, you have up to seven days to try—during this time, Kanzaki and I will not interfere with you," Stiyl said. "But if you fail to find a way to save Index, we will still hold the ceremony as usual when the time is up."

"What...what do you mean? Aren't you guys going to come up with a plan?" Kamijou Touma was confused. "You're the experts when it comes to magic, right? I'm just an outsider. How can I possibly find a way to save Index?"

"That's your problem. Come on," Stiyl said. "Also, after seven days, if you still try to stop us, be prepared to be killed."

Without giving Kamijou Touma a chance to respond, the two magicians turned and left quickly after they finished speaking.

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(End of this chapter)