After hearing the screams, Fujiwara Yuu and the others reacted quickly and rushed to the yakiniku restaurant called Tezuka Yakiniku-ya. As soon as they ran inside, they found the diners inside with confused expressions, and a blond man in a chef's uniform holding a grilled bird skewer and shouting towards the second floor.

"Hiromi, what are you doing? Are you scaring the diners?!"

There was a sound of hurried footsteps from the second floor, and a waitress with a headscarf on her head stumbled down the stairs. She leaned close to the blond man's ear and said something in a panic. The latter widened his eyes with an expression of disbelief.

Seeing this, most people could guess what happened in the space on the second floor. Matsuda Jinpei, who was keenly aware of something happening, quickly turned his head to look at Akihara Kenji and others who had rushed to the door. He said with a serious face:

"Yanji, please send them back first. We'll go upstairs and take a look."

"Okay, but I think we should call the police. This isn't something we can control... Hey? Fujiwara, are you going?"

Fujiwara Yu did not hear Akihara Kenji calling him. He walked straight past the two people blocking the stairs and rushed upstairs. He still held a glimmer of hope in his heart that the victim might still have a chance to be rescued, and with his medical knowledge, he might be able to save a life.

But when I arrived at the room with the open door on the second floor, my first reaction was that the temperature inside was very cold. My second reaction was that the whole room was filled with the smell of rust. There were a lot of dark red bloodstains on the floor, walls and ceiling.

As for the third reaction, it is probably that he doesn't understand what the victim had done that made the murderer attack him so cruelly. The amount of bleeding is probably not something that can be achieved by a few blows.

Moreover, the body was fixed to the chair. No wonder the waitress screamed so miserably. I really hope she won't have any psychological trauma in the future... For example, she will never dare to open her eyes and open the door again.

"How is it, is there any hope?!"

Zhu Fujingguang, who followed him upstairs, shrank back suddenly after seeing the scene. The large amount of blood reminded him of the night fifteen years ago. The horrible memory came back to him again, and he turned away with a grim expression.

"It's obvious there's no hope." Fujiwara Yu turned to look at Morifushi Kagemitsu with a sullen face. Noticing the grim expression on his face, he immediately said, "Morifushi, please have Matsuda and the others restrain the guests. Don't let any of them escape."

"OK."

Zhu Fujingguang frowned and walked towards the stairs. He leaned forward and said:

"Matsuda, please take control of the situation and contact the nearby police station."

"Okay." Matsuda Jinpei glared at the blond man who was trying to kick them out and walked towards the store entrance. He put his hands on his waist and shouted, "No one can leave until the police arrive. Please cooperate with the police investigation!"

Yin Dahang took out his cell phone and dialed the police station. After explaining the current situation, he also joined the team to comfort the diners.

Zhu Fujingguang, who was standing on the second floor, did not choose to conduct an on-site investigation. He went downstairs directly to look at the first witness who was trembling with fear, half-crouched and said gently:

"Hello, do you have clean, dust-free gloves in your store?"

"No, they've all been opened."

"Then there should be food sealing bags, right?"

"Okay, okay, I'll get it for you right away." Although the waitress didn't know where the other party came from, she always felt that they were very professional and had the feeling of police officers.

Fūya Rei patted Morobuchi's shoulder and said:

"Hiro, please help me get an alibi for the time of the crime downstairs. Don't go to the on-site investigation."

"Yeah, okay."

Zhu Fujingguang did not choose to be stubborn. He did eat a little too much tonight, and the psychological barrier of his parents' case had not been eliminated. Seeing a large amount of bloodstains similar to the scene at that time would induce post-traumatic stress disorder.

After taking the sealed food bag from the waitress, Rei Furuya quickly walked upstairs. He was surprised to see Fujiwara Yuu, who was squatting next to the corpse, already wearing clean gloves. He asked,

"Fujiwara, where did you get these gloves?"

"I carry them with me at all times, worried about unexpected situations." Fujiwara Yuu paused and calmly pointed to the shoe covers on his feet, saying, "Don't worry, I'm a professional."

“…”

Furuya Rei was speechless, even thinking that the guy in front of him was wearing gloves because he was a mysophobe. He looked at Fujiwara who was examining the frozen corpse and said in a serious tone:

"How about it? Can you calculate the exact time of death?"

"No. Although it is summer now, the air conditioning temperature in the room is very low, so it is impossible to estimate the most accurate time of death based on the degree of livor mortis and rigor mortis." Fujiwara Yu replied with a slight regret and shook his head.

After thinking for a moment, Furuya Rei took out his phone and called Zhufu Jingguang. After waiting for the other party to pick up, he hurriedly said:

"Hiro, could you please come to the room just below the first one on the stairs? I want to test the soundproofing."

"Okay, I'm over there now."

Fūya Rei jumped twice on the spot without much effort. Before he could ask, Zhufu Jingguang on the other end of the phone brushed off the dust from his hair and replied:

"Zero, the soundproofing of this BBQ restaurant seems to be a bit poor, and... the dust on the ceiling was shaken down."

"The sound insulation of the room is not very good. Does this mean that the victim was not killed during the business hours of the BBQ restaurant?" After hanging up the phone, Furuya Rei turned to look at Fujiwara Yu and expressed his opinion.

Fujiwara Yuu held his chin and thought for a few seconds before nodding.

"The killer turned the air conditioning temperature down to its lowest setting, hoping to simulate the exact time of death and delay the discovery of the body. Therefore, the killer would never risk striking during restaurant hours, as this would allow us to estimate the approximate time of death."

"Because this air conditioner can only reach a maximum temperature of 17 degrees, I think the victim's death should have occurred between 11pm last night and 2am today."

Relying on his rich theoretical knowledge and practical experience in clinical medicine, natural science theory, etc. in his previous life, he boldly expressed his judgment.

"If that's the case, then it's more likely someone they know committed the crime." Fūya Rei walked over to the door, leaned over, pointed at the doorknob, and analyzed, "The lock shows no signs of being pried. At that time, only someone they know could have caught the victim open the door without warning, right? Furthermore, it was closing time, so the possibility of someone inside the store being the perpetrator is even higher."

"Well, it's more likely that it was someone I know, but we can't rule out the possibility that an outsider broke in and hid in this room."

Fūya Ling nodded in agreement. He walked forward and his gaze fell on the victim's body, but he found something strange about it. He pointed at the victim's face and asked in confusion:

"Fujiwara, does his face look a little strange to you?"