Chapter 66 A and B
The police came quickly.

"Officer Fujisai, the deceased has been identified!"

A subordinate reported: "His name is Shinichi Mizutani, he is 19 years old, and he is a graduate of Minzhi Junior High School."

"A graduate? Then why is he in school?"

Officer Tongzhai squatted down to examine the body: "The strangulation marks on his neck should be the real cause of his death. He was nailed to the wall after he died... and there are confession marks on his body as well."

"Did you go to his house to investigate?"

Conan approached the police officer who was reporting.

"Yes! We found traces of a fight in his home. It should be the first crime scene... But, no useful hair or fingerprints were collected."

Megure asked, "What is the time of death?"

"Oh, between two and three last night."

The police officer saw Megure's momentum and blurted out the answer without thinking, even straightening his back slightly.

"Asshole!! He is the main suspect in this case! Who told you to say that?!"

Officer Fujisai was furious.

The police officer was so frightened that he immediately bent down and apologized.

Kudo Yusaku tried to smooth things over: "He was finally found at school, which means his death should be related to his life at school. We can put his interpersonal relationships after graduation aside for now."

"His peers have already graduated. It seems... I can only ask his teacher."

As Officer Fujisai spoke, he signaled his subordinates to summon the relevant personnel.

As they waited, Conan said, "Mr. Officer, what was the name of the dead mailbox maker?"

"Are you talking about the man whose eyes were pierced by an icicle?"

Officer Fujisai responded, "His name is Yoshimori Nobuyuki... Do you have any idea?"

Conan nodded: "It all started from that mailbox, or rather that confessional."

"Since we are applying to set up a club, there can't be only one member. Do you know who else has joined? They may know something!"

"The teacher at the time said that he was the only one who applied to run the club, and he didn't know if there were other members... We also asked about it, but to no avail."

Interesting... Is this the stage you are talking about?

Conan lowered his head and hid his eyes behind the reflective lenses.

Although it was not good, he was a little excited!
The most difficult homicide cases to solve are those where bizarre schemes are used but where the suspect cannot be identified and the circumstances of the case are complex and intricate.

Finally, he encountered a case that was not a choice between three options, and his fighting spirit began to burn.

"It looks like you already have an idea, Conan."

Because he was concerned about Megure next to him, Kudo Yusaku did not call Shinichi.

Conan shook his head: "No, I have no idea yet."

“There’s still a lot to figure out in order to solve these cases.”

He raised his chin. "But if these cases are all related, one thing is easy to guess - at least two people stole from the mailbox!"

Kudo Yusaku smiled and said, "You thought of it through the case category, right?"

"When the gangster was killed, the envelope left at the scene showed that the murderer believed he was acting in the name of justice. If this is considered a just act... then the death of the former principal is undoubtedly incompatible with it."

"Either the principal had done something shady and was killed after someone wrote it in the envelope, or...the two cases were not committed by the same person."

Conan continued: "Judging from the presence or absence of confessions on the bodies of the deceased in the two cases, it should be the second one."

"That's right!"

Kudo Yusaku agreed: "That means there are at least two murderers in the school."

"One is A. He will kill people he thinks deserve to die based on the envelope. Yoshimori Nobuyuki, Mizuko Shinichi, and the gangsters may have done something bad and he knew about it, so they were killed. The evidence is that they all have confessions engraved on their bodies."

"If A is called a righteous murderer..."

Conan said: "There is another evil murderer B in that school!"

"The former principal who didn't have confess engraved on his body was killed by him. The motive should be that the former principal prevented students from approaching the abandoned dormitory building."

"A needs a mailbox because he needs to filter out bad guys, but the one who killed the former principal was the evil B...which means B also needs a mailbox."

"The reason is probably..."

The two looked at each other and said in unison: "For blackmail!"

"He needs the secrets in the envelopes in the mailbox to blackmail others!"

Conan's eyes brightened as he looked at Fujisai: "Then next, we just need to ask the police officer to check who in the school has been blackmailed, and we can lock down B as a suspect!"

the other side.

Officer Fujisai is asking Shinichi Mizutani's teacher about his social life.

"To be honest, although I was his class teacher, I didn't have a deep impression of this kid. He was not a top-notch student, nor was he a hopelessly bad student. He didn't have any special characteristics, so I seldom interacted with him."

The middle-aged teacher looked distressed.

Officer Fujisai asked, "Then you should know who he was close to when he was in school, right?"

The teacher frowned and thought hard, but in the end he could only shake his head apologetically.

"...I understand. Thank you for your cooperation."

The head teacher was sent out of the dormitory building, and other teachers were called in for questioning one by one, but no valuable information was obtained.

So, Kudo Yusaku stepped forward and told Officer Fujisai his guess.

"Although it is not related to this case, there are no other clues now."

Officer Fujisai sighed helplessly and waved his hand to ask his subordinates to go to the school to inquire.

At this time, a police officer who went to investigate Megure came back and said, "Officer Fujisai, we found out that this gentleman did fly from Tokyo at 6 a.m., and we consulted other passengers on the same flight. Many of them have impressions of him."

"I understand."

Fujisai nodded to Megure.

Several people waited in silence for the police who were investigating the extortion to return.

Conan approached Megure and said, "Officer Megure, what do you think about this case?"

Megure did not answer directly, but just said: "The pursuit of stage play-like effects and visual presentation... is very similar to Su Beixun's style."

Conan was shocked: "You mean he's still alive?"

"do not know."

Megure said in a low voice: "I shot him in the chest at least three times, and jumped from a five-meter-high building... Logically, there is no way he could survive."

"But, if you force me to confirm, I can't say the three words 'he's dead'." Conan frowned slowly.

"Oh no, officer! Something terrible has happened!!"

A policeman rushed in and before anyone could ask, he shouted breathlessly, "The school... there has been a large-scale poisoning incident in the school!"

"What did you say?!"

Everyone's eyes widened as Officer Fujisai screamed in disbelief.

##
Rushing into the teaching building, I was hit by a strong smell of alcohol.

The campus, which is usually filled with laughter and joy, is now filled with sorrow and grief.

In the corridor of the teaching building, a large group of students fell to the ground and howled in pain, while some were frightened to the point of turning pale and standing by, at a loss as to what to do.

"An ambulance! Call an ambulance!"

Megure yelled impatiently.

Officer Fujisai rushed to the student closest to him and asked loudly, "What's going on? What happened?"

"I... I don't know... I was fine just now, eating... and suddenly..."

meal?!

Officer Fujisai looked suddenly at the lunch box that had been spilled on the ground.

But then I realized something was wrong!

The students' lunch boxes were all brought from home. If the poison was in the lunch boxes, it would be impossible for so many students to be poisoned at the same time!
"Forensic team! Collect everything scattered on the ground and take it for testing!"

He barked out orders.

It will be impossible to maintain the scene when the ambulance arrives soon, so we can only collect it in advance now.

Conan approached the student on the ground.

"The bitter almond smell... it's cyanide!"

"Could it be... that there are so many of them?!"

His pupils shrank sharply!
If these students were all poisoned by hydride...then the death rate...

And just as he was in a trance, the student closest to him had already breathed his last.

ten minutes later.

Several ambulances came roaring in and took away all the poisoned students.

"Investigate! Investigate for me! Get all the police officers to come and investigate!"

Officer Fujisai's eyes were red. "Who poisoned me? Where was it poisoned? Find out everything today!"

Megure was also standing nearby with his fists clenched. The masseter muscles on his face were particularly prominent, and he was obviously extremely angry.

Time passes quickly.

As the sun was setting, the investigating police officer finally came back to report: "Officer Fujisai, we found out!"

"Where was the poison placed?"

“…They’re everywhere!”

The police officer swallowed his saliva, unable to hide his horror.

"The walls of the corridors, the door handles of the classrooms, the shoe cabinets of the students, and some desks... In this school, the poison is everywhere!"

Officer Fujisai's eyes went dark and he staggered.

"It seems that the smell of alcohol has masked the smell of hydrogen."

Kudo Yusaku took a deep breath and managed to stay calm: "In this way, if the student gets the poison on his hands and accidentally puts it into his mouth while eating lunch, then..."

"Quick, inform the remaining students, tell them not to eat anything, and wash their hands and take a shower... Have the police accompany them and organize supervision!"

Officer Fujisai thought of the other students who were still detained at the school, and after recovering, he quickly gave an order: "And the hospital! Call them and tell them that the patients sent there may be contaminated with poison, so ask them to pay more attention!"

Megure asked from the side: "Where is the poisoner? Have you found out who it is?"

The policeman who came to report shook his head.

"It would take a lot of effort to apply the poison to so many places! And it wouldn't attract attention, so the best time was last night!"

Conan's thinking was clear: "This incident must be related to Shinichi Mizutani who died yesterday!"

"If this was done by someone in the school, then the only people who could have done this are A or B."

"This kind of indiscriminate killing of innocent people doesn't seem like the work of A, it should be B! But why? According to speculation, B should be mainly blackmailing... Or is there another murderer C in the school?"

Seeing such a tragedy, Kudo Yusaku also became serious: "It's possible, but we can't think so now. Before we find solid evidence to prove the existence of C, thinking too much will only disrupt our thoughts."

"Assuming that the poison was really given by B, we cannot accurately guess his purpose. We can only speculate based on the existing evidence - B wanted to silence the person he was blackmailing!"

Conan also followed up on this speculation: "But if that's the case, why would he use such drastic measures? It would be easier to just ask the blackmail target out and then kill him without anyone noticing."

"The only explanation is that there is not enough time! What happened yesterday provoked him? Even if it makes things worse, he has to do it today! Is it... the death of Mizutani Ikawa?"

"Probably!"

After Kudo Yusaku nodded, he continued, "The fact that Shinichi Mizutani's death could have stimulated B means that B knew him, or was even an accomplice of him!"

"It is very likely that B and Shinichi Mizutani also used the envelope in the mailbox to blackmail, but Shinichi Mizutani was killed last night because of the blackmail."

"After seeing his body last night, B was worried that he would follow in his footsteps, so he tried to kill the target of their blackmail. However, due to time constraints, he could only poison a large number of people to confuse the public."

Conan continued to think: "Then, how did A know about Shinichi Mizutani's blackmail? Was it because the blackmailer put the information into the mailbox and A happened to see it? Or is their blackmailer A?"

"If it was put into the mailbox, then the fact that B and Mizuko Shinichi were blackmailing each other must have been written on the envelope. A already knows B's name, so there is no point in silencing him to blackmail him."

"And if the blackmailer is A..."

Kudo Yusaku suddenly clapped his hands: "Wait! In this case, the person B wants to kill must be A!"

He became excited: "If B knows A's identity, then even if A is dead, we can still determine who A is!"

Kudo Yukiko scratched her head: "How can I be sure?"

Conan said: "B wants to poison A, it's impossible to rely on probability alone! A's activity range must be the place with the most dense poison coverage in the school!"

——Unless B knows nothing about A’s identity and he just wants to rely on luck.

But now, this is the only clue!

　It’s really hard to write this kind of plot. I have set up all the connections before and after, but I can’t write from a bird’s eye view.

　　I could only start from one thread and work my way down, turning left and right, and I almost felt dizzy after turning so many times.

　　You can take a look at the logic below to see if there are any mistakes. If there are, please point them out and I will revise them.

　　
　
(End of this chapter)