Detective Conan: Orange-flavored summer

"That's right!" Shangguan Qianxia showed a confident smile on her face. Because of her god-level observation skills and a little bit of foresight, she quickly understood the murderer's modus operandi.

"Who is it? Who killed my husband!" Hirota Toshiko said loudly.

Officer Yokomizo said, "Madam, please calm down. Is there any suspicious person coming here to see your husband tonight?"

Hirota Toshiko pointed at Shangguan Chinatsu and the others and said, "Including these few people, there should be seven or eight people who came here tonight."

Shangguan Qianxia said calmly: "Because my friend accidentally got the wrong disk and sent her disk to Professor Guangtian, we just came here to get it back."

"All the data on the disk is gone. It seems that the data on the computer may also be gone."

"Who is this little girl?"

"Ah, it's my sister." Huihara Shimi said standing aside.

As she said that, she went over and picked up Huiyuan Ai. She said, "Okay, Ai, don't touch this."

Shangguan Qianxia looked at Hirota Toshiko and said, "Madam, could you please tell us who else came here today besides us?"

Hirota Toshiko recalled: "At that time, my neighbor's wife and I were about to go out, and a student came to see my husband. I remember his last name seemed to be Hosoya."

Upon hearing this, Officer Yokomizo immediately said to the police officer beside him, "Go and bring me Hosiya, who was here to visit Professor Hirota tonight!"

When the police officer heard this, he immediately responded, "Yes!"

Officer Yokomizo looked at Hirota Toshiko and asked, "Madam, do you know the names of the other guests?"

Hirota Toshiko shook her head and said, "Well, I only remember Ms. Shangguan who called me before I left."

Then she added, "My husband told me that two or three more students will come to see him today."

Officer Yokomizo pondered for a moment, then said, "In that case, we have no choice but to check all of Professor Hirota's students."

"Oh my, this phone seems to be glowing!" Conan said while lying on the ground looking at the phone.

Then he looked up at Officer Yokomizo and continued, "This is called a telephone message, right? If you can listen to it, you might find out something."

Officer Yokomizo looked at Conan in surprise and said, "I remember you seemed to be the kid next to Detective Mori."

Dr. Agasa quickly said: "Hahaha, actually he is my relative."

Officer Yokomizo nodded and did not pursue the matter. He nodded and said, "Yes, there may be some clues in the phone message."

"There are 13 messages in total."

"13 calls, that's quite a lot of messages," said Officer Yokomizo.

Then they played the message: "Hello, I'm Shirakura, Professor Hirota, we have an appointment for tonight, right?"

Officer Yokomizo turned around and looked at Hirota Toshiko and asked, "Who is this Mr. Shirakura?

"I have seen this Mr. Shirakura before. He is very young."

Then, the message continued to play: "I'm Morioka, what time would be a good time for me to go there tonight?"

"Where is Mr. Morioka?" Officer Yokomizo asked again.

Hirota Toshiko said, "I know this Mr. Morioka. He seems to be his earliest student. He often comes to our house to play."

"So, do you know the address and phone number of Mr. Shirakura and Mr. Morioka?"

"I know." Hirota Toshiko nodded.

At this time, a man appeared at the door and said, "Well, to be honest, my last name is Shirakura."

"Excuse me, what happened? Did something happen?" Shirakura said.

Officer Yokomizo replied, "Professor Hirota was killed by someone today."

Shirakura had a surprised look on his face: "Ah!"

At this time, the phone message came out again: "Moshimoshi, Professor, this is Shirakura. I have something unexpected to do tomorrow, so I'll come to your place right now."

Officer Yokomizo looked at Shirakura suspiciously and said, "Mr. Shirakura made 10 calls and Morioka made 2. Mr. Shirakura, don't you think you left too many words?"

"Didn't I tell you, Mr. Policeman? The professor wasn't here no matter how hard I tried, so I had no choice but to come here directly." Shirakura explained.

On the side, Shangguan Qianxia smiled and thought, it must be him, but the evidence...

"By the way, how could this happen?" Shirakura asked puzzledly.

The message continued, "I'm from the insurance company. I'd like to explain our new insurance to you. Is this convenient tonight?"

At this time, Huiyuan Ai whispered: "Walker."

"Could it be..."

Huiyuan Ai shook her head and said, "They won't leave any evidence."

Shangguan Qianxia squatted beside the chess board. She looked at the chess board and the telephone, a smile appearing on her face.

"Shangguan, do you have any idea?" Conan asked Shangguan Qianxia in a low voice.

Shangguan Qianxia nodded and said, "I roughly understand his modus operandi."

"Nani?!"

……

Soon, Morioka and Hosoya arrived at the scene.

Officer Yokomizo finished his questioning as per usual.

"Officer Yokomizo, I think I know who is the murderer of Professor Hirota." Shangguan Chinatsu said.

Officer Yokomizo turned around and said in surprise: "The murderer could be..."

"It was an accident. It was a complete accident. Professor Hirota got drunk and fell down with the bookshelf, hitting the back of his head and died." Morioka said as if it was a matter of course.

"this…"

"Well, please go out for a while and watch me demonstrate my method of committing the crime before you make any conclusions."

"Well, okay, I'll trouble you, Miss Shangguan."

"In fact, this method is very simple. The murderer only needs the tape of the telephone recorder and the chess pieces to perform this seemingly accidental murder in a closed room."

"Ms. Shangguan, I have bought the tape back."

Shangguan Qianxia took the tape from the police officer with a smile and said, "Officer, please give me a pair of gloves as well."

"Oh well."

Putting on the gloves, Shangguan Qianxia walked into the room and said, "First, pull the tape inside this tape to the appropriate length, and then install the tape on the phone."

Then she continued, "Of course, these straps are to be placed outside, and then these pulled out straps are straightened out and brought to the outside of the door, and then the loops on the key are passed through the straps, and then the key is left outside the door, and the remaining straps are brought back into the room."

Shangguan Qianxia paused, glanced at the people behind him, and continued, "Arrange these chess pieces of the same height into a triangle, put the extra end of the tape on the chess piece close to the phone, and finally, put the notebook on top of these three chess pieces of the same height."