Sunday.

It had rained lightly in the morning, and the ground was still a little wet.

Qiao Qiao's trunk was tied to a slightly bloated black box, which attracted the attention of many passers-by.

Ota Ward, one of the 23 wards of Tokyo, is located in the southernmost part of Tokyo and is known for its high-end residential areas and a large number of factories, as well as Haneda Airport.

This is not the jurisdiction of Qiaoqiao's branch, and he rarely visits.

On the streets, you can see all kinds of large and small factories, and occasionally you can see an apartment, which has the texture of an industrial city.

When I arrived at Haneda Airport, it was already close to noon.

As soon as he parked the car and carried the suitcase, Qiao Qiao saw a black luxury car parked at the entrance of the working area of the terminal.

Ariko Asano stepped out of the car.

She is wearing a white shirt with a sailor collar today, a pleated skirt and bubble socks on the bottom, the bow at the neckline and the skirt are crimson, and her shoulder-length hair is tied with red sandalwood paper and a double ponytail.

All in all very cute.

However, Ariko Asano doesn't seem to be in a good mood.

When she saw Qiao Qiao, she puffed out her cheeks, and then sighed as if she had given up something, and then walked over.

"Good afternoon, teacher."

I said hello, and my expression was a little complicated.

"Asano-san, good afternoon."

Qiao Qiao responded, then showed his ID to the officer on duty at the door, and after waiting for a while, a man in a civil aviation uniform walked out.

"My name is Kazuki Shinkai, and it's great that you're the soul slayer introduced by the boss."

He looked about forty years old, thin and capable.

"Shibasaki in our group was the first to discover the problem, and after that, the air traffic control of other groups also encountered similar situations, so you can ask them when the time comes."

As he spoke, the roar of the engine could be heard in the distance.

A plane was taking off, heading towards the still somewhat gloomy sky.

"It's the first time I've seen planes take off and land at this angle so closely."

Qiao Qiao sighed with emotion, and saw that on a high slope outside the airport, there seemed to be many onlookers.

"Those are all aircraft enthusiasts, and they often stay outside the airport to film the take-off and landing of aircraft, and some will also listen to the communication band."

Kazuki Shinkai explained casually.

"Communications can also be spied on by outsiders?"

Ariko Asano, who had been absent-minded before, sprung up with curiosity.

"These are all public bands, as long as you have the equipment and qualifications, you can listen to them, but there is no way to send signals."

Kazuki Shinkai took the two of them to the office building, which was full of people wearing civil aviation uniforms, Qiao Qiao took a closer look, and many people's clothes were not the same.

It's probably the difference between airport staff and airline staff.

"This commission, I look at the data description, and it also started with aircraft communication?"

Qiao Qiao asked.

"Well, that's right, Shibasaki was the first to receive that communication."

Kazuki Shinkai opened the door to a small conference room, and inside, a young man was waiting nervously, and the young man became even more uneasy at the sight of Kazuki Shinkai and Johashi and Ariko Asano behind him.

After a brief chat, Qiao Qiao asked the air traffic controller named Shibasaki Dadi to describe the situation at that time.

In simple terms.

Haneda Airport recently encountered a ghost flight.

Of course, in a realistic sense, ghost planes actually exist.

However, it refers to a situation in which the pilot loses control for various reasons, and the aircraft continues to fly on autopilot.

Thirty years ago, there was a strange incident in which a fighter plane malfunctioned, and after the pilot parachuted, the fighter plane continued to cross the border without crashing, and even almost led to international disputes.

In the field of civil aviation, similar incidents have occurred in the past, and eventually led to major accidents that killed hundreds of people.

But this time, Haneda Airport encountered a real ghost flight.

Usually only in the evening to late at night, the air traffic control responsible for liaising with the captain receives a distress signal, followed by a communication that is severely disrupted.

The content of the newsletter was broadcast in English, and while there seemed to be subtle differences in each communication heard, it was generally similar.

The other party claimed to be Flight 7500, and the air pressure in the cabin of the plane was abnormal, and requested landing and support.

Qiao Qiao does not understand the professional knowledge of civil aviation, but when he studied fighter piloting before, he probably knew that if the air pressure in the cabin of the aircraft is abnormal, it can easily lead to hypoxia, but often fly in the stratosphere at high altitude of civil aviation airliners, such an abnormality will basically lead to major accidents.

There was once a flight where the air pressure problems when flying at high altitude due to the negligence of the captain, and as a result, all the passengers, including the captain, died of suffocation due to lack of oxygen.

Putting aside these miscellaneous conversations, after the tower receives such a communication, the information of this flight will also appear on the radar, and it is usually very close to the airport, and after about fifteen minutes, the figure of the plane will appear over the airport, and then crash into the airport.

However, when airport staff went to the accident site to check, they found that there was nothing.

There were no crashed airliners, and there were no wreckage.

Even if you check the recording afterwards, you can only hear the sound of the tower, and the other party's communication is not recorded at all.

At first, Shibasaki Daichi thought that he was overworked and had a delusion, and he didn't pay attention to it.

But then, almost every night, there will be one or two similar situations.

It even affected the communication of normal aircraft.

After all, it is impossible to completely ignore such a major matter that concerns human life.

In the midst of high tension, problems are likely to occur.

Fortunately, there has been no accident for the time being, but in any case, it will appear every night, and the ghost flight that challenges the nerves of air traffic controllers still needs to be solved.

So, Kazuki Shinkai thought of the boss he knew before.

"We think this might be the work of the spirits, but we'll have to leave the specifics to the soul slayer."

He said.

"7,500 flights, according to you, don't exist?"

Qiao Qiao marked the key points on the information with a pen and raised his head and asked.

"Well, yes, we don't have such a flight number here."

Shibasaki replied.

"You said you saw the plane fall, so can you see the model of the plane and some details?"

"It's the Boeing 737-300, this type of aircraft has been discontinued a long time ago, and there is no one in use in China."

Kazuki Shinkai replied.

"...... that way"

Qiao Qiao took out his mobile phone, and after a little search, he put it in front of the two air traffic controllers.

"Have you ever seen this movie?"

On the mobile phone, a movie about air crashes is displayed, and the flights in it are exactly 7,500 flights.