No one understands the laws of Collider better than me.

"Ah! Nanatsuki! I'm so sorry to bother you now that you're a police officer."

"It's nothing, it's nothing. The police are here to serve the citizens. So what kind of trouble did you mention on the phone?"

The old woman holding the broom cried out "Ah!" and then said with a somewhat frightened expression:

"It's this room 206. It used to be empty, but strange noises would always come from inside."

"Oh, I see. Let's go in and take a look then."

Grandma Jiang nodded. As the administrator, she naturally had a key, but she just didn't dare to go in alone.

After opening the door and conducting a quick inspection, it was discovered that there was no one inside, and the noise did not seem to be coming from a water pipe or anything else.

However, on a small table in one of the rooms, there was a box labeled "Premium Melon." Fruits are quite expensive in Japan, especially premium melons like this.

Grandma Hejiang didn't think much of it and immediately tried to open the box to take a look. However, Koshimizu Nanatsuki sensed a dangerous aura and pulled Grandma Hejiang away the moment she opened the box, but she herself was the one who was attacked.

The box didn't contain fruit, but a bottle of tear gas spray. Nanatsuki Koshimizu, sprayed in the eyes, collapsed to the ground, opening her eyes to find she could barely see. Meanwhile, Grandma Koshimizu managed to dial an ambulance, her anxious voice leading the operator to believe a police officer had been shot.

"Grandma, don't worry. Take my phone and take a few pictures of this room. Then find someone named 'Kitahara Masaki' in my contacts. I need to call him and report the situation."

Nanatsuki Koshimizu discovered that aside from some blurred vision, she was otherwise unharmed, so she quickly calmed down and called Masaki Kitahara. Upon learning that his subordinate had been tricked by some unknown scoundrel, Masaki Kitahara immediately drove to the scene.

Within two minutes of the commotion, a woman ran to the door of room 206 and, upon seeing the woman suddenly approaching, shouted:

“Yuri, this lady has an eye injury. Could you help me support her? I’ve already called an ambulance. Let’s go down quickly. Ah, this is Ms. Shirakawa Yuri from the government’s social welfare department.”

“Oh, I see. Thank you so much, Ms. Shirakawa. I’m Nanatsuki Koshimizu from the First Criminal Investigation Division of the Metropolitan Police Department. I was just trying to check if anything had happened here for the old lady, but I ended up in this mess.”

Whether it was because she couldn't see, Nanatsuki Koshimizu could clearly hear that Ms. Shirakawa's breathing became noticeably more rapid after she heard that she was a police officer.

As she went downstairs, Koshimizu Nanatsuki heard the voices of the onlookers, and one voice stood out in particular. It sounded like someone's footsteps, and the sound gradually faded away, making it seem like he was running away. However, one of his legs was clearly dragging.

After being put into the ambulance, she was quickly taken to the hospital for examination. Kitahara Masaki also rushed to the hospital. After learning about the specific situation from Ms. Koshimizu, he naturally went to the apartment building and asked each household. As the boss, Koshimizu Nanatsuki was the mascot of the First Criminal Investigation Division. He had to find out who the culprit was and make him understand why the police were not to be trifled with.

Chapter 240 Help Nobita, Doraemon's Sad Dream

“I had a stroke five years ago and haven’t been able to work since. My supervisor is Ms. Yuri, and she has always taken good care of me.”

"Oh, I see."

Kitahara Masaki carefully knocked on every door, noting down the names of residents who didn't answer. He patiently greeted each resident he met, carefully inquiring about room 206 and how they were doing there. Only after Koshimizu Nanatsuki called again did Kitahara Masaki rush to the hospital.

"Tear gas spray caused corneal damage, which can cause vision loss and eye pain for about a week."

"Huh! So you mean you won't be able to see things very clearly for a whole week?"

However, Kitahara Masaki breathed a sigh of relief; at least he could recover, which was a stroke of good luck amidst misfortune.

"Ahem, Masaki, I was injured on the job..."

"Yes, I know. I'll hire two nannies to come and take care of you. Oh, by the way, the photos on your phone show that the balcony door to that room is open. I also just went to that apartment building and found one resident who seems a bit suspicious. They claim to be doing online stock trading, but their room is completely dark, and they don't want me to see what's inside. Also, I've had the tear gas spray tested, and I expect to have the results soon."

"That's not what I wanted to ask... Oh well, just take me home."

After Kitahara Masaki helped her fasten her seatbelt, he immediately took Koshimizu Nanatsuki home and told her family to keep an eye on her and prevent her from running away.

The next day, analysis revealed that the tear gas spray contained the same components as tear gas canisters used by police in various countries to suppress riots. The box also had a carefully designed mechanism that would spray tear gas at anyone who opened it.

So this was a trap set by someone, probably to kill someone. It just so happened that Koshimizu Nanatsuki, who was checking the situation, opened it, so the criminal didn't appear but immediately escaped, after hearing the word 'police'.

Just as Kitahara Masaki was about to take a team to check for any eyewitnesses after the incident, Inspector Megure suddenly called and said:

"Brother Kitahara, a body has been discovered on the site of a new apartment building project at Teito Real Estate's Shinada branch!"

Upon hearing the news, Kitahara Masaki sighed and could only entrust the task of finding the suspicious person to the patrol officers below him, while he immediately rushed to the scene.

The victim was found dead in a warehouse on development land. There were obvious ligature marks on his neck, and he could smell some kind of industrial chemical agent on his body. However, there were no signs of resistance. It is estimated that the murderer made the victim inhale the chemical agent, causing him to lose consciousness before strangling him.

Then the first discoverers were the Death Detective League, who found it when they came here on an 'adventure'.

However, no suspects have been found yet, so Kitahara Masaki decided to go to the nearby Teito Real Estate Company to inquire first, hoping to find the suspect through his interpersonal relationships. However, after arriving at the place where the deceased worked, the information he got from his superior was all useless information, such as that the deceased, Morita Yuzuru, was a person who always achieved his performance targets and was a kind and ordinary person.

This boss was acting like it was none of my business that he was dumbfounded, so you definitely wouldn't get anything out of him.

However, behind the door to the tea room, a woman appeared to be peeking out at the police.

After entrusting the questioning to Takagi, Kitahara Masaki used Conan's favorite excuse of urinating to sneak into the break room. Finding the woman still there, he immediately locked the door and silently typed on his phone:

"If you know anything, please tell the police. Finding the culprit quickly will put your mind at ease."

The office lady thought for a moment, then silently began typing, her fingers moving so fast they left afterimages.

“A few nights ago, I secretly saw the store manager and Morita arguing. The store manager said that the guarantors of the tenants brought by Morita were all fake, but Morita said that as long as the rent was paid properly, it would be fine. He also threatened the store manager that if he did not sign these people, he would be reprimanded by the headquarters this month. Then the store manager gave in. I originally thought it was just a dispute over the contract. I never expected that Morita would be killed.”

"Okay, thank you very much for your help."

Just as Kitahara Masaki was about to leave, the office lady typed another line and asked:

How did you know I knew these things?

"Hehe, a competent police officer will definitely be able to see the troubles of citizens. If you have any trouble in the future, please rely on the police more often."

Unaware that he had gained another female admirer, Kitahara Maki left with Takagi and the others. Then, through the information of the branch where Morita worked, it was discovered that chemical materials had been stolen from the warehouse of the Okra resin products sold in the store, and the stolen chemical materials were consistent with the drugs detected on Morita.

Although the evidence seemed very unfavorable to the store manager, Kitahara Masaki, as a 'responsible' police officer, also investigated what was going on with the customer introduced by Morita.

"This Morita is a bastard. As an agent, he introduces very old houses and haunted houses, which are hard to rent out. Moreover, most of the people who sign the lease contracts are beneficiaries of the social security system. However, he falsifies the names in the guarantor column. It is obvious that he uses those old people to boost his sales performance and then uses his own store manager to take the blame."

In pursuit of efficiency, Kitahara Masaki asked hacker Ai to hack into the Teito branch's database, only to discover a rather infuriating fact.

Those who become beneficiaries of the social welfare system are primarily elderly people or disabled individuals who are unable to care for themselves; government assistance is essential for these vulnerable groups. However, Morita may very well have allowed these destitute people to live in substandard housing and even robbed them of the social welfare funds they receive.

What's even more concerning is that the apartment where Koshimizu injured his eye was also sold and leased by the Teito branch. However, at this time, a problematic salesperson from the branch was murdered, suggesting a possible connection between the two events.

With that in mind, Kitahara Masaki disguised himself as a plumber and went to the apartment building again. Since he couldn't enter people's homes smoothly as a police officer, there was no search warrant available. So Kitahara Masaki used this compromise method to enter the homes of the elderly people and discovered that they all had surveillance cameras installed in their homes.

"Oh, so there were surveillance agents. This search was quite successful."

Kitahara Masaki immediately recalled the last time he patrolled the building as a police officer, there was a house with a slovenly man living in it. The man claimed that he was trading stocks even though the lights were not on.

I was originally thinking of arresting and beating up the guy who was suspected of being the monitor, but then I thought that in order to investigate the case, I could only use a gentler approach.

"Please, Doraemon."

Chapter 241 Severing the Business Chain

By hacking into the monitor's phone, it was discovered that the person he contacted most frequently in his address book was the actual manager of the apartment building.

"Hey, Yue Shui, could you help me ask Grandma Jiang who's usually in charge of collecting the management fees?"

“Oh, okay… I told Grandma Jiang that it was a man named Masayama Sugi. The paint management company he works for usually hires elderly people like Grandma Jiang as general managers. Masayama is the kind of manager who manages the money. The apartments Masayama manages are all old apartments or haunted houses, but Grandma Jiang said he has never complained.”

Heh, of course that bastard wouldn't complain. This so-called dilapidated place actually made him a lot of money.

"By the way, ask Grandma Jiang if she remembers the place called the Okla Resin Products Warehouse?"

"...Grandma said yes, that's also a warehouse managed by the paint management company, because that warehouse is near the apartment, and you can always smell a strange odor when you pass by."

Kitahara Masaki suddenly realized that the person who stole the chemicals from the warehouse wasn't the manager of Teito Real Estate's branch office, but someone from the warehouse management company. Now everything connected.

"Okay, I think I'll be able to help you 'get revenge' soon, Yue Shui."

"Hey! They found the culprit on the second day? Masaki, I want to catch the culprit too!"

Kitahara Masaki, who had initially considered scolding her for being ridiculous, thought it best to bring her along. After all, she was Kitahara Masaki's personally chosen deputy, and it would be good to have her participate in the final operation.

"Alright, but you have to follow my instructions! Also, we need to ask Grandma Jiang for a favor."

----------------

"Miss Hejiang? Miss Hejiang? Where are you?"

A man dressed in black sneaked into the Okra resin products warehouse. He pulled out a bundle of hemp rope, which still had blackened bloodstains on it.

"Oh, Mr. Mayama, what are you doing here? Why are you dressed like that? Are you planning to act in some TV series? Or are you planning to do something bad?"

Kitahara Masaki emerged from the shadows with amusement, looking at the 'fully armed' man who was about to kill.

"Hey! It's you! Didn't that old woman tell me to come here?"

"Yes, you and Ms. Jiang put on a show for us. In the end, all she said was 'she knows everything,' and you foolishly believed her. It seems you think old people are easy to bully, right? Hurry up and admit it! You're the murderer who killed Morita, the marketing employee at the Teito Real Estate branch! The motive was probably a dispute over the spoils. You stole the chemical that can cause dizziness from here, then drugged Morita and strangled him. The evidence is on your person and in your hands. Hurry up and confess your crime!"

Even without this evidence, Kitahara Masaki could wait a few days until the search warrant was issued, then catch the monitor red-handed. Even if Mayama denies it, it won't matter, because installing surveillance cameras is definitely related to the administrator.

However, after Kitahara Masaki revealed the truth, Mayama naturally panicked. He had thought his opponent was an old woman, but it turned out to be a police officer. His eyes darted around, and as he stammered, he suddenly saw Koshimizu Nanatsuki standing at the door, still wearing sunglasses. Realizing that the policewoman in front of him was blind, he rushed forward without thinking.

"Sister Yue Shui! The prisoner is rushing over."

The Junior Detective League, who had secretly followed Koshimizu, intended to warn her, but Koshimizu had already heard Mayama running over. She raised her cane and swung it down as if she were practicing kendo. Mayama, who couldn't react in time, was knocked unconscious. Conan and Ai Haibara, who had already raised their Genius tranquilizer watches, were very surprised. They were so good even when they couldn't see. No wonder she was Kitahara Masaki's chosen second-in-command!

The stunned Junior Detective League clapped their hands, then were each chopped off by Kitahara Masaki and thrown back to Professor Agasa's house.

After bringing Mayama back, he immediately confessed his accomplices—besides Morita, whom he had already killed, there was also Ms. Shirakawa from the Department of Life Support.

Morita of the real estate agency, Mayama of the management company, and Ms. Shirakawa of the welfare department—only such a tightly linked chain of crimes could allow them to exploit such a large number of people. Shirakawa's job was to introduce suitable applicants for living allowances to Mayama and Morita, and then issue approvals for the applications. Morita found properties with the lowest rents, while Mayama collected exorbitant management fees.

However, her suspicious behavior that day was overheard by Koshimizu, so Kitahara Masaki, a good boss who trusts his subordinates, naturally paid attention to this young lady. Sure enough, he found several calls with Shirakawa in Mayama's phone call records. The three of them knew each other, and there was concrete evidence.

So, on that day, after Koshimizu entered the room, Mayama immediately jumped off the balcony, injuring his leg, which Koshimizu overheard. Then, Ms. Shirakawa, who went upstairs to check the situation, naturally encountered Koshimizu—meaning that Morita wanted too much of a share, causing Shirakawa and Mayama to set a trap to kill him. Koshimizu thwarted their plan, but the two of them, still determined to kill Morita, did so.

After recording Mayama's testimony, Kitahara Masaki, along with Koshimizu, took Shirakawa back to the police station. After explaining his reasoning to the woman who had nowhere to run, Kitahara Masaki slowly asked:

“Ms. Shirakawa, as a member of the Welfare Division, you not only deceived elderly people who are unable to work, but you also participated in an unjust murder. Don’t you feel ashamed?”

“I don’t think I did anything wrong. I helped those useless old folks find houses to live in! I saved them from having to be homeless! I saved them!”

"Are you kidding me!"

Koshimizu Nanatsuki shouted loudly.

"Your job is to help those who have lost their ability to work, and you've taken advantage of those who should be being helped for your own selfish desires! How can this be forgiven!"

A week later, Nanatsuki Koshimizu's eyes had fully recovered. After lamenting how troublesome it was to be blind, she bought many gifts to visit those who had been exploited. She explained the cause and outcome of the matter to them and told them that they could call her if they had any problems in the future, and that she would do her best to help these elderly people with disabilities!

Chapter 242 He sees everyone as a mole

Kitahara Masaki woke up early today because he suddenly had a bad feeling, so he is now standing by the window waiting for the bad news to arrive.

beep beep.

The call came from someone whose contact information was 'upper respiratory tract infection', which immediately made him frown. This was because the person causing the trouble was Gin, and he had to follow Gin's orders, since he was the one the boss had given him.