Monogatari Series - Volume 23 - Chapter 1.29

029

“If ‘F/C’ are also initials, I wonder if there’s someone from the girls’ basketball team who has those initials,” said Gaen-san, the human representative of logic, after hearing my report.

We were once again in Naoetsu General Hospital, in yet another hospital room different from the three we’d been in earlier—the hospital room where Kanguu Misago-chan’s mummy had been put up.

“I wonder if the message was left on a cell phone to hint at that. Since they had matching straps with their initials.”

“Aah… That’s right, they did have those,” I said.

In that sense, I would’ve had more hints to decipher it than Meniko did.

It wasn’t really a contest, but I did find it a bit frustrating.

“By the way, Kanguu-chan also had a strap. Since she’s Kanguu Misago, it was ‘M K’.”

“Eh? But wait, Gaen-san. Wouldn’t that mean that the vampire that we’re looking for is actually among the members of the girls’ basketball team?”

If, not the dying message, but the living message was indicating a specific member’s initials, and Suicidemaster was being falsely accused of a crime, then that would be it.

“F C”.

“Not necessarily. It could be that Kanguu-chan, in a hazy state of mind, was just trying to write the name of a friend she thought of. Or it’s an act of deception to make us think that way. In other words, diversionary tactics by Suicidemaster.”

A vampire trying to blame a human for their vampirism—it seemed a little narrow-minded, almost pitiful at that, and not at all in line with the image of a vampire. Well, if we can consider the possibility that the crime is being pinned on Suicidemaster, why can’t we consider the opposite?

Taking it to extremes, it was even possible now that this was a diversionary tactic to make us think that everything was fabricated, like a deduction in a honkaku mystery.

Us people of logic.

“You’re right. It would be too unexpected a truth for there to be a vampire among the club members.”

“I don’t remember explicitly denying that possibility. You can’t say for sure that there aren’t more oddities like you, Koyomin, that put on an air of innocence and casually attend school, right?”

“Again with the jokes.”

And this was a bad joke, at that.

The phrasing of “air of innocence” felt like biting words.

“It’s not entirely a joke, though. Well, this is just a brute force through all the possibilities at the moment. Like a canvassing operation done by throwing more people at the problem. It’s true that, as a result of last night’s events, the suspicion placed on Suicidemaster has faded. ‘F C’ seems like it would be fairly rare for initials, so I’m sure we’ll be able to narrow it down to just a few girls out of the hundred on the basketball team…”

As she spoke, Gaen-san began flipping through the register of names borrowed from Higasa-chan, beginning her check. I’d promised not to make any copies of it, so it was the original document.

“For reference, do you mind if I ask, Koyomin? About how the code was deciphered. It’s possible that the method can also provide a hint for us.”

“Understood. However, I don’t think it’ll be very relevant.”

“I’d like to hear it anyway. I may not exactly be a sciences person, but it’s not like I hate number puzzles. It’s a great way to exercise the mind and relax.”

Relax?

Putting aside exercising the mind… She didn’t really look like it, but was Gaen-san actually stressed right now? With this incident taking longer than expected, Kagenui-san drawing closer to the town with every moment, and my betrayal that must not be forgotten, well, there were plenty of things that could be cause for concern.

Well, if revealing the trick is somehow relaxing, then I’ll gladly do so.

It’s atonement for my infidelity.

“However, this code ended up not being a number puzzle. It had nothing to do with prime numbers, either—though it’s still in the sciences, it was not mathematics, but the field of natural sciences.”

“Natural sciences? If we’re talking about fields, in middle school, they’d divide the natural sciences into the ‘first field’ for physics and chemistry, and the ‘second field’ for biology and geology.”

“In that respect, it would be the first field—Celsius and Fahrenheit.”

In other words, temperature notation.

Like numbers, temperature was the same throughout the world, or perhaps even throughout the universe, and high temperatures were high, low temperatures were low, and absolute zero was absolute zero—but temperature wasn’t notated in the same way everywhere. The units differed.

And that difference was Celsius and Fahrenheit.

“Ah—that’s why it’s ‘F’ and ‘C’?”

As expected of a logical person, she caught on fast. After speaking, Gaen-san flipped the register shut—it seemed she’d finished checking it all.

She was even fast at reading.

“But how does ‘820/280/610/160’ become Celsius and Fahrenheit? Although, since Celsius is ‘C’ and Fahrenheit is ‘F’, perhaps I should ask how it becomes Fahrenheit and Celsius.”

“For both Celsius and Fahrenheit, a ‘°’ is placed in the top right direction to denote ‘degrees’. In the same place where you would write an exponent.”

“Do an explanation like that for a science major. I got it just from you saying ‘in the top right direction’—don’t go off in a completely different direction, Koyomin. And?”

“We look at the ‘0’ in the code and interpret it as a ‘°’—basically, the ‘0’ in ‘820’, the ‘0’ in ‘280’, the ‘0’ in ‘610’, and the ‘0’ in ‘160’, all the zeros at the end of the numbers, should not be taken as numbers but as symbols. Then, ‘820/280/610/160’ becomes ‘82°/28°/61°/16°’.”

“Aha. Highest and lowest temperatures, huh?”

That was exactly it.

The code that had been left behind was showing yesterday’s temperature, represented in both Celsius and Fahrenheit—just like the Rosetta Stone, which could be described as the originator of cryptanalysis.

However, the essential letters of the alphabet were missing—“F” and “C”.

“That’s why, ‘F/C’ becomes the deciphered text to the code. Oh, but if they’re initials, you can’t really call that a text. But I see. It’s amazing that someone could come up with something like that.”

“Yes. Checking the daily high and low temperatures may be natural for an athletic person, but even then, I don’t think they would have been able to come up with that in their hazy state of mind.”

“No, my intention was to praise your friend, Koyomin.”

It would be a bit troublesome if you show too much interest in her.

If you point your finger at her.

This was entirely my own self-interest, but I wanted to settle this case before I needed to ask for help with a third code…

But after relying on Hachikuji and getting Shinobu’s cooperation and borrowing Kanbaru’s house, I’d strayed pretty far from what I’d originally intended, so maybe next time I’d just give up and go to Ougi-chan for help with the cryptanalysis… Although, that girl likes to be befuddling, so she definitely wouldn’t just give me the answer straight up like Meniko.

She was also a person of logic. A mysterious form of logic.

But anyway, let’s return to the main subject.

For the sake of protecting Meniko, and for the sake of resolving this case.

“But anyway, how many people in the girls’ basketball team have the initials ‘F C’? Although we’d probably need to check whether that girl has a strap or not…”

Since the first mummy, Harimaze Kie-chan, didn’t have a strap on her phone, it wasn’t a given that everyone had a matching strap. Perhaps, within the club, that small level of resistance against peer pressure was allowed.

“There were as many as zero people.”

“Eh? What did you say?”

“Sorry, that was a weird way to put it. Zero. There were none, is what I meant. Girls with ‘F C’ as their initials, that is.”