Jiangdong District, Tatsumi-chome, the crime scene.

Nan Lin Guiyi was inspecting the situation at the crime scene and started to analyze it from the main entrance. Faced with the provocation of Ezaki Mari, Nan Lin Guiyi ignored it at all and took out a note book on his own and began to record the situation.

"The door lock is a split ferrule holder lock, with high safety performance and cannot be cracked using simple tools, so the second possibility is ruled out." Nan Lin Guiyi continued to analyze and completely ignored Mari Ezaki.

Walking into the room at the crime scene, Nan Linguiyi looked at the location at the door, "The scene was destroyed, and the situation was initially impossible to judge. Ignore it for the time being and find more physical evidence information."

Fukuda Kato followed Nanlin Guiyi and smiled at Chiba Shikaido, "Officer Chiba, although Guiyijun is a newcomer, Guiyijun is a top student at Waseda University and has strong work ability. In another case, Guiyijun found key evidence."

Qianba Qihai asked curiously, "What is the key evidence?"

"Hehe!" Kato Fukuda did not say it, but changed the topic, "Let's first look at Gui Yijun to see if he can discover the abnormal situation in this case."

Nanlin Guiyi came to the victim. The victim Shimada Yamaki sat on the sofa, and the utility knife was still inserted into Shimada Yamaki's neck. The physical evidence technicians from the Tokyo Bayshore Police Department were still laying the positioning board and the volumetric ruler.

"When is the death time?" Nan Lin Guiyi asked the forensic doctor on the scene.

The forensic doctor at the scene was a 50-year-old uncle. He glanced at Nan Lin Guiyi and then responded, "It was initially concluded that the time of death was from 10 pm to 0:00 in the morning last night."

Nan Lingui nodded, used the camera to shoot quickly at the victim's body. After a while, Nan Linguiyi took a few steps back and took the camera to check.

Kato Fukuda looked closer and found that Nan Lin Guiyi had enlarged a partial image on the camera and was observing the situation of the utility knife. He asked, "Guiyi, is there anything strange about this utility knife?"

Nan Lin Guiyi shook his head, "Nothing strange, but Senior Kato, is this a clue? Check where is the nearby place to sell such a utility knife?"

Kato Fukuda laughed and cried, "This is just an ordinary utility knife. It is difficult to find out how to buy it. I bet that at least ten stores sell such utility knifes within one kilometer nearby."

Qianye Qihai also affirmed, "To be precise, it should be seventeen convenience stores and one supermarket, all of which have utility knifes for sale."

Nan Linguiyi nodded slightly and continued to observe. He walked towards the kitchen and bathroom, took photos, and analyzed to himself, "There are no abnormal signs in the kitchen and bathroom, and there is no suspicion for the time being."

Mari Ezaki was ready to mock him again, but was stopped by Chiba Qihai. Although Mari Ezaki was Chiba Qihai's partner, the two were actually in a superior and subordinate relationship.

Nan Lin Guiyi returned to the living room and walked towards the balcony. He asked, "Officer Chiba, is the isolation door of the balcony open when you arrived at the scene?"

Chiba Qikai nodded, "Yes, when we arrived at the scene, the isolation door was already open."

"By the way, Officer Qianye, who called the police? How long is the alarm time?" Nan Lin Guiyi continued to ask. Although Nan Lin Guiyi is a physical evidence technician, he also has considerable reasoning ability.

Chiba Qikai frowned slightly, then thought for a while before explaining to Nanlin Guiyi, "The person who called the police was a living nanny hired by the victim. According to the other party's description, as long as the victim was in Tokyo, she came every morning to cook breakfast for the victim and clean up the room. This morning, she came over and found that the victim was dead. So, call the police quickly to deal with it."

Nan Lin Guiyi nodded again, without answering Chiba Qihai, so he walked towards the balcony isolation door. After approaching the balcony isolation door, Nan Lin Guiyi stopped Fukuda Kato and others from continuing to follow up, and he entered the main balcony of the living room alone.

On the balcony, Nan Lin Guiyi observed carefully. After a moment, Nan Lin Guiyi clapped his hands suddenly, "I discovered it!"

Fukuda Kato chased after him and asked excitedly, "Guiyi, what did you find?"

Nanlin Guiyi did not answer Kato Fukuda, but used a camera to take photos and record the evidence found. After the record was completed, Nanlin Guiyi asked, "Officer Chiba, your people have not entered the balcony yet, right?"

Qianba Qihai shook his head, "Not yet."

Nan Lin Guiyi breathed a sigh of relief and explained, "I found a footprint on the balcony. The suspect's height was about 178 cm to 185 cm. I looked for other ones to see if there were any surprises."

A hint of joy flashed in Kato Fukuda's eyes. The suspect's height judgment was the same as that in Haruecho. Perhaps it was really the same suspect?

Nan Lin Guiyi looked for it again. Nearly five minutes later, Nan Lin Guiyi clapped his hands again, "I found out how the murderer entered the room!"

Before Kato Fukuda and Chiba Qikai asked, Nanlin Guiyi explained, "The murderer should have climbed directly from the first floor, along the rainwater pipes and the balcony to the third floor, and then entered the room from the balcony."

Ezaki Mari said with a chord, "How do you know that the balcony isolation door is not locked?"

Nan Lin Guiyi replied with a faint smile, "Because the isolation door of the balcony is not broken. If the isolation door of the balcony is locked, the murderer cannot open it and can only force it to enter. However, since there are no signs of forced entry, the isolation door of the balcony is naturally not locked."

"You...this is just your guess!" Ezaki Mari snorted coldly.

Nan Lin Guiyi shrugged, "I just made reasonable inferences based on the current situation. As for the specific situation, you are from the search class, I am only from the physical evidence class. That is your job, right?"

Fukuda Kato smoothed out the scene, "Okay, OK, Guiyi, please continue to see if there is anything unusual? In addition, Guiyi, I think you are quite suitable for search classes. Do you want to turn around?"

Nan Lin Guiyi does want to enter the search class, but he did not graduate from a police-related school and could not enter the search class directly. He could only start with the physical evidence class.

In addition, if Nan Lin Guiyi had just joined the Tokyo Metropolitan Police Department and jumped from the physical evidence class to the search class, it would be a bit unexpected. Therefore, Nan Lin Guiyi temporarily rejected Kato Fukuda's invitation.

"This... Senior Kato, I heard that colleagues in the search class sometimes seem to have to face gun gangsters, right?" Nan Linguiyi laughed dryly. Although he didn't say it clearly, the subtext was that the work of the search class was too dangerous, or that the physical evidence technology was safer.

Mari Ezaki finally found a good place to attack Nanlin Guiyi, "Hmph, coward!"

Chiba Qihai coughed and scolded: "Officer Ezaki!"

Kato Fukuda was also a little embarrassed, but Nan Lin Guiyi was with him, so he could only smile dryly, "Physical evidence courses are also good. The key to solving cases is that we must rely on physical evidence courses!"

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