Multiple choice system: Conan World

"That call wasn't made by that kid... That call wasn't made by that kid!! "

When Masumi Sera realized this, he was horrified.

She immediately guessed that it must be the mysterious man who saved her and drove Vermouth away who picked up the voice changer and called the house.

Although Masumi Sera did not hear what the person on the other end of the phone said.

But through Vermouth's answer, she was able to roughly guess what the other party said.

"Since that person was able to impersonate Kunio Koizumi to scare Vermouth."

'Then he must be someone who has had contact with this dismemberment case.'

"Besides me, the kid, and the Kanagawa prefectural police, there is only one person left who has come into contact with the dismemberment case—"

'That was Akikawa Kyousuke, the first eyewitness who watched almost the entire incident!'

Masumi Sera felt her heart begin to pound in her chest.

The more she thought about it, the more frightened she became.

Because she had a hunch.

If I continue to think about it, it is very likely that all my previous judgments about Akikawa will be completely overturned.

"When Kunio Koizumi said that his family was threatened and a police officer was killed by the organization, Akikawa happened to be at the door of the room."

"Could it be that he used this to determine that the person threatening Kunio Koizumi might be the murderer of his mother?"

'Come to think of it, when Chianti was on the phone, he also added, "Even if you've been on the run for more than a decade, we can still find you."

At that time, Masumi Sera thought the person on the phone was Conan, so she didn't think much about it.

Now think about it.

If the person on the other end of the phone was Akikawa Kyousuke.

Chianti's remarks undoubtedly equated himself with the murderer of Akikawa Ryoko.

Sera Masumi even couldn't imagine it.

If the person on the other end of the phone was really Akikawa Kyousuke.

How angry he must have been when he heard Chianti's words.

'Think about it again, if that person is really Akikawa, then what is the purpose of his calling? '

"Is it to confirm the identity of the person Kunio Koizumi is trading with...?"

Just as Sera Masumi was thinking about it in her heart, suddenly a feeling of nausea hit her chest again.

Since she ran away in the middle of her treatment, Masumi Sera is still in a state of hydrogen sulfide poisoning.

Masumi Sera quickly reached out and pressed the inside of his forearm, about three finger widths above the wrist crease.

This is Neiguan point.

By pressing the Neiguan point, you can relieve the urge to vomit.

At the same time, Sera Masumi suddenly felt a flash of inspiration pass through his mind.

Her eyes were much brighter.

'I figured it out!'

"It takes time for hydrogen sulfide to break out, and Akikawa's call was to buy time!"

"If Akikawa hadn't called me at that time, Vermouth would have taken me and the computer out of the room."

"In order to avoid this situation, Akikawa pretended to be Kunio Koizumi and called in!"

After figuring out all of this, Masumi Sera suddenly stood up and ran quickly into Kunio Koizumi's room.

Conan, who was originally sitting on the sofa, was also startled by Sera Masumi's sudden reaction.

"Ms. Sera, what's wrong with you?!"

Conan shouted and hurriedly ran after Sera Masumi.

Police from the Forensic Division and the Kanagawa Prefecture Detective Police are investigating Kunio Koizumi's room.

They were all shocked when they saw Sera Masumi rushing in.

Shira Masumi didn't want to explain to them, but asked anxiously:

"Have you measured the concentration of hydrogen sulfide in the room?"

"0.001% is normal."

A police officer answered.

Masumi Sera was slightly surprised when she heard that, and then she turned her unique deep green eyes to observe everything in the room.

'The windows were all open.'

'The air conditioner was also set to the highest temperature and the fan speed was also set to the maximum.'

'There are also several signs of fighting.'

After confirming the condition of the room, Sera Masumi almost instantly confirmed that his previous judgment was correct.

At the same time, he also deduced how Akikawa Kyousuke poisoned everyone in the room.

"The only way Akikawa could have produced hydrogen sulfide was after I hid in Kunio Koizumi's room."

"He didn't create the conditions for hydrogen sulfide in the room in advance, and he didn't know we would enter Kunio Koizumi's room later."

'After we entered the room, the door to the lobby on the first floor was also tightly closed.'

'Then the only way for hydrogen sulfide to pass through is through the vent at the bottom of the wall connecting to the courtyard.'

'Hydrogen sulfide is heavier than the atmosphere and in the absence of wind and rising air, it will sink to the bottom.'

'You have to climb a flight of stairs to get to the private hot spring outside Koizumi Kunio's room, so the room is lower than the private hot spring yard.'

"Then Akikawa only needs to generate hydrogen sulfide gas in the yard, and the hydrogen sulfide gas will naturally sink to the room."

'According to the structure of the Kosenan Hot Spring Hotel, the balcony on the upper floor is located above the private hot spring.'

'Although you can't see the private hot spring below from the balcony, you can still throw the container into the yard.'

Now that we have the hydrogen sulfide gas, the next step is to find a way to get it into the room.

Although there is a vent in the room connecting to the yard, hydrogen sulfide gas does not necessarily enter the room through the vent.

"I remember that the air conditioner was turned on in the room."

'Because the room is heated, the temperature inside the room is higher than outside, so the air pressure inside the room is lower than outside.'

'Since air flows from "high pressure areas" to "low pressure areas", the hydrogen sulfide gas that sinks in the yard will be carried by the air and enter the room through the vents.'

'After that, Akikawa called and dragged Vermouth and Chianti into the room, waiting for the concentration of hydrogen sulfide in the room to rise, and for Chianti and others' symptoms of hydrogen sulfide poisoning to gradually worsen.'

'This is Akikawa's method.'

'He used the "pressure balance" property of the air to poison everyone in the room.'

"The reason why no hydrogen sulfide gas was detected in the room is that Akikawa once again used another characteristic of air flow—"

'The property of density change.'

'After Vermouth and Chianti escaped, Akikawa turned the air conditioning temperature and wind speed in the room to the maximum.'

'The purpose of this step is to further increase the temperature of the air in the room.'

'When air is heated, the air molecules gain energy, move faster, and expand in volume, so the number of air molecules per unit volume decreases, that is, the density decreases.'

'The hot air becomes lighter than the cooler air around it due to its reduced density, so it rises.'

'At this time, Akikawa opened the window, allowing the rising hot air to "escape" from the room.'

'So the hot air will drive the hydrogen sulfide that sinks to the bottom away from the window and quickly dissipate into the outside air.'

'Hydrogen sulfide entered the room from the yard and left the room to return to the yard.'

'This is a technique that can only be accomplished if the terrain, temperature, and room conditions are all met at the same time.'

Sera Masumi's face was full of surprise.

Even though she had seen many cases with sophisticated techniques, she couldn't help but be amazed by Akikawa Kyousuke's performance.

What is strong is not Akikawa Kyousuke's technique.

Instead, Akikawa Kyousuke thought of all this based solely on his memory of the few minutes he was taken to the door of Koizumi Kunio's room yesterday afternoon.

"As expected... your initial judgment was correct."

"This Akikawa, both his intelligence and observation skills are far beyond ordinary people!"

Originally, Masumi Sera was still worried that Conan's judgment was correct and Akikawa Kyousuke was indeed a threatening criminal genius.

However, after being convinced today that Akikawa Kyousuke indeed possessed abilities far beyond those of ordinary people, Sera Masumi no longer had such worries in her heart.

"Akikawa didn't need to open the window and turn up the air conditioner temperature and wind speed."

'He did all this just because I was in the room.'

Sera Masumi lowered her head slightly, her black bangs covering her eyes, but could not hide the smile that overflowed from the corners of her mouth.

Although there were still many things she hadn't figured out in her mind, she was no longer worried because she knew Akikawa Kyousuke's abilities.

because--

Akikawa Kyousuke really wanted to save himself.

Since hot air has a lower density, it experiences an upward buoyancy force according to Archimedes' principle, causing the hot air to rise.

Cold air is denser and is more susceptible to the pull of gravity, so it sinks more easily.

The basic principle mentioned in the article that air flows from high-pressure areas to low-pressure areas is the pressure gradient force.

Pressure gradient force is the force acting on the air due to pressure differences.

Air always flows from areas of high pressure to areas of low pressure in an attempt to achieve pressure equilibrium.

　　This force is one of the main drivers of motion of fluids, including air.

　　(By the way, the part that explained in detail how the bath agent kills people was deleted by the review)

(End of this chapter)