In Conan, people have a brain option system

"Miss Sera, have you thought of something?"

Conan noticed Sera Masumi's expression and asked curiously.

He didn't understand why Sera Masumi could still smile so happily even when the mission failed.

"It's nothing, I'm just a little impressed by the mysterious man's modus operandi."

Sera Masumi shook her head slightly and said with a smile.

"It's really ingenious. You can actually think of using air pressure to let hydrogen sulfide enter the room, and then using density to dissipate the hydrogen sulfide without leaving any traces."

After Conan saw the wide open windows in the room and the air conditioner turned on to the maximum, he also deduced the mysterious man's method.

And what surprised him the most was.

The clues about the mysterious man have basically been dealt with completely.

No matter the identity of the mysterious man, the container used to generate hydrogen sulfide, or even the reactants used to generate hydrogen sulfide, nothing is known.

In addition, the surveillance videos at the scene were deleted and closed by Belmode.

Therefore, Conan was unable to find any clues that could identify the identity of the mysterious man.

"Suppose that the mysterious person did not control the amount of hydrogen sulfide generated."

"Or maybe he didn't let the hydrogen sulfide gas in the room dissipate."

"That would not only put your life in danger, Miss Sera."

"When the police arrived and opened the door of Kunio Furuzumi's room, hydrogen sulfide gas would instantly enter the lobby on the first floor, affecting many people."

"With all the surveillance footage deleted, it will be difficult for us to catch that person."

Conan said with some fear.

"But that didn't happen, did it?"

Sera Masumi asked with a smile.

"Obviously the mysterious man is not a bad person, and he has no intention of involving innocent people."

"And he was obviously very confident in what he was doing and that he would not infect others."

Conan raised his left eyebrow slightly when he heard this, and looked at Sera Masumi in surprise.

"Why do you always feel like Miss Sera, you have a high opinion of that mysterious person?"

"And he seemed to understand the other person very well in his words."

"You haven't already guessed who the other party is, right?"

Conan asked.

"No, how is that possible?"

"The famous 'Kudo Shinichi' didn't even think of the other party's identity, how could I possibly know it?"

When Sera Masumi said "Kudo Shinichi", she did not make a sound, but made a mouth shape silently.

Conan stared at Sera Masumi speechlessly for a while, without any further suspicion.

Sera Masumi looked at Conan lost in thought.

It is also clear,

As long as Conan didn't know that Akikawa Kyousuke had called the room pretending to be Kunio Furuzumi, it would be impossible to suspect Akikawa Kyousuke.

In addition, Conan does not know the grudge between Akikawa mother and son and the organization, so he cannot doubt Akikawa Kongsuke from his motives.

This is an absolute barrier created by information gap.

No matter how smart Conan is, he can't overcome it.

"Boy, are you curious about that person's identity?"

Sera Masumi looked at Conan and asked.

"certainly."

Conan said in a deep voice.

"That person really wants to kill Chianti and Belmod, so he must have a lot of connections with the organization."

Sera Masumi nodded upon hearing this.

‘It seems that the boy is still upset about Chianti’s death and the incident of letting Belmode escape. ’

'For the boy, our plan this time is really fruitless, and we didn't get a single bit of information. ’

Sera Masumi thought to herself, then pushed the door open and went outside, and walked up the stairs to the private hot spring.

She began to observe her surroundings carefully.

Trying to find some loopholes left by Akikawa Kyusuke.

However, she was not able to get what she wanted.

She didn't even see a single container or any trace of the reactants used to react to produce hydrogen sulfide.

Sera Masumi then left the room and went to the monitoring room.

Started checking the surveillance video.

The surveillance video is indeed as Conan said, all the videos from the night before have disappeared.

Therefore, we were not able to capture the scene of Belmode and Chianti entering Kosen-an.

But there was something strange about De Sera Masumi.

‘If Belmode wants to erase the evidence that she entered and exited Kosen-an, is it necessary for her to delete the surveillance videos in the guest room area, stairs, and elevators? ’

'And, speaking of it, it seems that she has no need to delete the surveillance. ’

'She herself was disguised, and the Chianti obscured almost all her features. ’

‘And with the way they act, it doesn’t seem to have any impact even if they are caught on camera, right? ’

This is what Sera Masumi only thought of after confirming that Akikawa Kyusuke was the mysterious person.

Because Conan said that due to the lack of surveillance video, he could not identify the mysterious man.

In other words, it was not just Belmode and Chianti who did not appear in the surveillance video.

Akikawa Kyusuke was also not caught on surveillance cameras.

So Sera Masaki suddenly had a guess just now.

Could it be that the surveillance video was actually deleted by Akikawa Kyousuke?

Akikawa Sousuke lives on the second floor of Kosen-an, so if he wants to take action, he will definitely be captured by the surveillance camera.

In order to conceal his identity, he deleted all the surveillance videos of the corresponding time period to create the illusion that Vermouth deleted the surveillance videos.

‘If you want to make hydrogen sulfide gas, you must have something that can react to produce hydrogen sulfide. ’

‘In the murder case two days ago, the murderer used the bathing agent sold in Kosen-an to make hydrogen sulfide gas and killed people. ’

‘Naturally, if Akikawa Sousuke wants to make hydrogen sulfide gas, one of the easiest sulfide-containing reactants is the bathing agent. ’

‘The bathing agent stopped selling after the case two days ago, so Akikawa Sousuke must have bought the bathing agent in advance. ’

Sera Masumi thought to himself and adjusted the interface of the surveillance video to arrange by date.

Then he saw.

Not only the surveillance videos from yesterday to today disappeared.

The surveillance video four days ago also disappeared.

Needless to say, it must be Akikawa Sousuke or his agent who bought the bathing agent four days ago.

That's why Akikawa Sousuke deleted all the surveillance videos of that day.

"Oh my god, this Akikawa is really amazing..."

"It's really like a secret agent... It's so watertight."

Sera Masumi couldn't help but sigh quietly, and then leaned back on the chair.

Although his reasoning should be the truth in nine out of ten cases.

But the problem is that there is no substantial evidence of what Akikawa Sousuke did.

Even if it is found that Akikawa Sousuke's bathing agent is missing, there is no evidence to prove that he did all these things.

Besides, Sera Masumi still hasn't figured it out.

How did Akikawa Sosuke know that Koizumi Kunio would hand over to the organization tonight?

How did he know that the masked Chianti was the murderer of his mother?

Because Sera Masumi clearly remembered that Chianti was wearing a motorcycle helmet that completely concealed his facial features on the national highway.