In Conan, people have a brain option system

After hearing what Dr. Agasa said, both Matsutani Choichi and Motoki Mayumi suddenly showed extremely horrified expressions on their faces.

"Wait, what are you talking about?!"

"What about using bath additives to kill people? I don't understand at all!"

"Ms. Motoki and I don't know each other at all. You didn't believe this person's nonsense just because you heard it?!"

Matsutani Choichi pointed at Akikawa Sosuke and said loudly to Dr. Agasa.

"Yes!"

"I don't know this person at all. How could I help him kill people? Don't joke!"

"I just happened to step on a corpse when I was taking a bath this morning. You were all deceived by this artist!"

Motoki Mayumi also refuted loudly.

The deputy police chief of Kanagawa Prefecture came to the two of them and said in a serious tone:

"We found a leather suit used for stage plays in the room of the deceased Kenji Furusawa, and detected a high concentration of hydrogen sulfide in it."

"According to Dr. Agasa's judgment, the murderer made hydrogen sulfide in the hood and put it on Mr. Furusawa's head, thus killing Mr. Furusawa with a small amount of hydrogen sulfide gas."

"Mr. Furusawa should have put the hood back in the actor's dressing room after the stage play yesterday, but the hood appeared in his room, indicating that the murderer brought it out for the purpose of committing the crime."

"And Mr. Matsutani, as an actor in the stage play, you will not be suspected even if you enter the actor's dressing room."

The deputy police chief said.

"No, no, no! This Akikawa Sosuke is also an actor! Why do you only suspect me?"

Matsutani Jōichi obviously could not accept the deputy police chief's statement. He pointed at Akikawa Sosuke and asked loudly.

"Because among all the suspects, only Mr. Matsutani's room was found to have bathing agents."

"Dr. Agasa" spoke at this time and said to Matsutani Jōichi.

"The hood has been taken away by the police from the Identification Division to test the corresponding ingredients in it."

"I think the ingredients of the bathing agent that you used, Mr. Matsutani, can be detected in it, right?"

"But even if that's the case, what does it mean? Couldn't it be that Akikawa Sosuke bought the bathing agent and threw it away after using it?"

"You suspect me just based on a bathing agent, it's too outrageous!"

Matsutani Jōichi obviously couldn't accept Dr. Agasa's statement, and he became more and more excited.

"This bathing agent itself was made to restore the open-air hot spring of Kosen-an. I'm afraid that among ten thousand buyers, there won't be one person like Mr. Matsutani who would use it in Kosen-an's room."

It feels like a person who has traveled thousands of miles to be invited to a famous restaurant.

He could have sat in the restaurant and enjoyed the most authentic food prepared by the chef for free.

But he refused the food prepared on site and chose to spend money to eat the semi-finished food sold in the restaurant for gifting.

This kind of thing seems very unreasonable.

"Is it okay if I don't like to take a bath with others? Who stipulates that you must take an open-air hot spring when staying in a hot spring hotel?"

Matsutani Changyi continued to refute.

"Mr. Matsutani, why, when the ingredients in the headgear have not been detected, you have already tacitly accepted that the bathing agent in the Kamen Ultraman headgear is the bathing agent you bought?"

Conan said coldly, holding the bow tie voice changer.

Matsutani Changyi was speechless when he heard this.

At this time, Akikawa Sosuke spoke up:

"I have never bought bathing products, Mr. Matsutani."

"If you don't believe me, you can check the cameras in the souvenir shop."

Akikawa Sosuke pointed to the big sign "Surveillance inside, theft is illegal" posted at the entrance of the souvenir sales area.

In order to prevent people from stealing goods in the souvenir shop when there are many people,

Kosenan installed cameras in the souvenir sales area.

"Although I don't know what the relationship between bathing products and murder is, you can check whether I have bought bathing products by comparing the surveillance video."

Akikawa Sosuke said to Matsutani Jōichi with an innocent look.

"All signs indicate that it was you, Mr. Matsutani, who secretly took out the mask of Kamen Rider, and then used the bathing agent to make hydrogen sulfide gas to kill Mr. Furusawa."

"It was you, Mr. Matsutani, who had the bathing agent, and it was you, Mr. Matsutani, who was able to enter the actor's dressing room and take out the mask of Kamen Rider."

"Mr. Matsutani, you perfectly meet the murderer's conditions."

"Mr. Matsutani, do you have anything else to say about this?"

Conan pressed on and continued to ask.

"How could you kill someone without bathing agents? I'm just an actor and I don't know anything about this!"

"Moreover, according to what you said, hydrogen sulfide gas cannot be made with bathing agents alone, right?"

"I don't have anything that can make hydrogen sulfide gas with bathing agents!"

Matsutani Jōichi's remarks made Akikawa Sosuke realize something again.

'Sure enough, he also found the other acidic substance from the hot spring hotel. '

'It is precisely because of this that Matsutani Jōichi is confident that what he has done will never be exposed. '

‘The other reactant must be something that is readily available and will not be suspected! ’

After confirming that one of the reactants used to generate hydrogen sulfide is a bathing agent, the remaining reactant is very simple.

At least Akikawa Sosuke can think of at least four things that can be found in this hot spring hotel, which contain acidic components and can react with the sulfide in the bathing agent to generate hydrogen sulfide.

Among them, the easiest to get and the least suspected is the laundry detergent in the laundry room on each floor.

When the bathing agent containing sulfide is mixed with the laundry detergent containing acidic components, the sulfide will decompose to generate hydrogen sulfide gas.

And it happens that there are no cameras in the corridor of the guest room area, so entering and leaving the laundry room will not be captured by the surveillance camera at all.

Akikawa Sosuke's guess was confirmed the next second.

I only heard the little loli with brown short hair beside Conan whispered:

"It's laundry detergent."

"Mr. Matsutani, the other thing you used to react with the bath agent is the laundry detergent in the laundry room!"

After hearing what Haibara Ai said, Matsutani Changyi's face became a little uglier.

He still insisted on his statement, but his rebuttal became more and more pale and powerless.

"I don't know what you are talking about at all. Do you have any evidence that I did it?"

Suddenly, at this time, the sound of an ambulance sounded.

Then several emergency personnel came in and carried Kojima Genta, who fainted due to hydrogen sulfide poisoning, out.

Then the deputy police chief of Kanagawa Prefecture said in a deep voice:

"The child was poisoned and fell into a coma because of the hydrogen sulfide left in the mask by the murderer."

"Although this was caused by the carelessness of the child, remember that the murderer who made the hydrogen sulfide in the mask is also responsible!"

After hearing what the deputy police chief said, the faces of Matsutani Jōichi and Motoki Mayumi became much uglier.

They really didn't expect that there were other people who were harmed by hydrogen sulfide.

The deputy police chief looked at the reactions of the two and felt that the time was almost right, so he turned to look at the subordinate police officer on the side and whispered:

"Separate Mr. Matsutani and Ms. Motoki for interrogation."

"Under the prisoner's dilemma, I believe that the two of them will definitely identify each other."