In Conan, people have a brain option system

The facts were consistent with Akikawa Sosuke's judgment.

After Conan and Haibara Ai realized that the deceased died of hydrogen sulfide poisoning, they immediately asked the police to test the concentration of hydrogen sulfide in the air in the female hot spring area.

The result was [0.001%], far below the lethal concentration of [0.07%].

The test results revealed two pieces of information.

One is that the murderer did not commit the crime where the body was found.

The other is that it was not dangerous for the police to conduct on-site inspections here.

Akikawa Sosuke did not see the police testing the concentration of hydrogen sulfide in the air,

but he judged this through the reactions of the police at the scene and Conan and others.

Moreover, Akikawa Sosuke also judged that.

The murderer chose to use hydrogen sulfide to kill people in order to use this gas, which can be seen everywhere in Hakone, which has natural hot springs, to cover up his murder method.

Because Akikawa Sosuke clearly knew the concentration required for hydrogen sulfide to cause acute poisoning.

So he judged that this could not be an accident.

There must be a murderer who made a high concentration of hydrogen sulfide gas and killed Kenji Furusawa.

But the biggest difference between hydrogen sulfide and toxins such as potassium cyanide is that it is a gas.

Gas means that it will easily affect people around.

In addition, this gas is heavier than the atmosphere.

So in the absence of wind, it is difficult for hydrogen sulfide to drift away from low-lying areas.

If the murderer did not control the amount when making hydrogen sulfide gas, then everyone around the room where he committed the crime would probably suffer.

This is why Akikawa Sosuke said that as long as the murderer intends, he can kill all the residents in the surrounding rooms, including himself, at any time.

Obviously Conan made the same judgment.

So he asked Dr. Agasa to instruct the Kanagawa Prefecture Detective to investigate the suspects as soon as possible and catch the murderer.

‘The latest time for ordinary tourists to enter the hot spring area is 20:00 in the evening, and after 21:00 in the evening, non-resident tourists are prohibited from using the hot spring. ’

‘So the murderer is either a staff member of the hot spring hotel or a guest who stayed here last night. ’

The police inspector of Kanagawa Prefectural Police Headquarters looked at the notebook in his hand and repeated in his mind the judgment that seemed to be made by Dr. Agasa, but was actually made by Conan.

He first sent the police to check the alibis of the staff of the hot spring hotel who were on duty here last night.

The result confirmed that all the staff were not suspected of committing the crime.

The second step was to check the surveillance cameras.

In order to protect the privacy of the guests, Kosen-an did not set up cameras facing the corridor of the guest rooms.

Instead, cameras were set up in the elevators that must be passed through when going up and down the stairs, and at the staircases on each floor.

After the police learned from Dr. Agasa that the murderer should have committed the crime in the room, they focused on checking the surveillance at the staircases in the guest room area and in the elevators.

Then they successfully saw a very suspicious scene in the surveillance video at the staircases on the second floor-

A person who wrapped himself tightly, dragged a black suitcase and went downstairs through the staircases at around 1:20 in the middle of the night.

The police immediately realized that this should be the murderer transporting the body.

After all.

The other party dragged such a heavy suitcase and chose to take the stairs, obviously to avoid the surveillance in the elevator.

Soon, the content of the surveillance video proved the police's guess.

The tightly wrapped person returned to the second floor from the stairs about twenty minutes later.

But when the person returned, the original suitcase had disappeared.

Obviously.

The other party threw away the suitcase after throwing the body.

After that, the police asked the staff responsible for cleaning the female hot spring area of ​​​​Guquanan.

It was confirmed that they finished cleaning at 0:30 in the middle of the night, and they did not see any bodies at that time.

Therefore, the police locked the murderer in the guest room area on the second floor.

"We have checked all the staff of Guquanan and confirmed that none of the staff are likely to commit the crime."

"Secondly, through checking the surveillance, it was determined that the murderer was a guest living in the standard room area on the second floor."

Based on the murderer's method of committing the crime, Conan judged that this was a premeditated murder, so he believed that the murderer was likely to know the deceased.

Then the suspects are four stage actors including Akikawa Sosuke.

And because the two passers-by among the four stage actors are locals in Kanagawa Prefecture and do not live in Kosen-an,

So the suspects are Akikawa Sosuke and the man named Matsutani Jōichi who plays the monster.

In addition, the woman named Motoki Mayumi who first discovered the body and also lived on the second floor.

The police temporarily locked the suspects on these three people.

"The only camera that captured the murderer was the surveillance at the staircase entrance on the second floor of the guest room area, but because the murderer deliberately concealed his body shape, it is not possible to judge the murderer's gender and body shape very well."

"But the murderer dumped the body between 1:20 and 1:44 in the middle of the night, and none of you three have an alibi for this period of time."

Motoki Mayumi, who first discovered the body, was immediately unhappy when she heard the reasoning of the deputy inspector in front of her.

She looked at the police officer angrily, and then shouted:

"Why am I also a suspect?!"

"I don't know the deceased at all!"

The deputy inspector said:

"This is just your one-sided statement, Miss Motoki, and it can't prove that you really don't know Mr. Furusawa."

Motoki Mayumi was a little angry, and she retorted:

"But if you follow your logic, then everyone living on the second floor should be a suspect."

"After all, you don't know whether the other party really doesn't know the deceased or is lying."

"Besides, it's 1:20 in the middle of the night, most people at this time We are all asleep, right? How can we have an alibi? "

Another suspect, Matsutani Cho, who played a monster in the stage play, nodded and agreed with Motoki Mayumi's statement:

"That's right! Anyone could know Mr. Furusawa!"

"You are too ridiculous to conclude that I am a suspect just because I performed with Mr. Furusawa?"

"What about the motive? What good would it do for me if he died? If he died, I would not become the lead actor, and my work would be interrupted early!"

Both Motoki Mayumi and Matsutani Choichi were strongly dissatisfied with the police's suspicion.

And the people present also subconsciously looked at Akikawa Sosuke.

It was obvious that Akikawa Sosuke would also vent his dissatisfaction to the police like the two of them.

Then they saw this handsome chestnut-haired artist looking at Mayumi Motoki and Jyouichi Matsutani with a confused look on his face, and then he said:

"Speaking of which, Mr. Matsutani and Ms. Motoki, you two should know each other, right?"

"Yesterday I seemed to see you two gathered together to discuss the production of some gas."

Akikawa Sousuke's words made the expressions on Mayumi Motoki and Jyouichi Matsutani's faces freeze in an instant.

Then the two of them almost at the same time, made extremely confused sounds:

"Ah——?!"

"What——?!"