"The delayed ignition device is the telephone fax machine. Before we leave, the prisoner lights the candles on the cake again and puts them under the telephone fax machine. Then he sends a fax around 2:50. The paper printed by the fax machine will be lit by the candle on the chair, causing a fire."

Baiyan Zhenyu looked at Conan who was thoughtful around him and said, "the prisoner probably took the opportunity to leave the box and used the fax service in the store near karaoke. I'll go there and ask now, and I'll leave it to you."

"Well, leave it to me." Conan nodded solemnly, and then ran to Kawasaki to try to find clues about the prisoner from their conversation.

Baiyan Zhenyu drove back to the commercial street and found that there were few stores open at night. In addition to the karaoke store that sang before, only a 24-hour convenience store was still open.

Baiyan Zhenyu walked into the convenience store and bought several bottles of drinks. Taking the opportunity of checking out, he asked the shopkeeper, "boss, have any guests come to you to buy something around three o'clock?"

"Three o'clock..." the boss handed the change to Bai Yan Zhenyu and recalled: "it seems that only a few college students singing in the store next door have come and bought cigarettes and tomato juice."

Baiyan Zhenyu's eyes lit up and couldn't wait to ask, "do you remember what they looked like?"

"I remember a little brother with brown hair, a beautiful woman in a black dress, and a little brother with black complexion who cut the athlete's head."

After the boss said the appearance characteristics of the three people, he complained discontentedly: "by the way, the little brother with black skin still vomited at my door for a long time, which took me a long time to clean up."

After listening to the boss's description, Bai yanzhenyu immediately understood that he was talking about the three people of Kawasaki, Asaka Zhizi and Noguchi Zhijiu.

Bai Yan Zhenyu smiled at the corner of his mouth and continued to ask, "boss, did any of them use your fax machine?"

"Well, how do you know?"

The boss looked at Bai Yan Zhenyu in surprise and replied, "the glasses brother used my fax machine. At that time, I specially reminded him that the paper was put upside down. As a result, he didn't even listen. He also made some cream on the paper. It's really a troublesome guy."

"Thank you, boss."

After getting the answer, Bai yanzhenyu immediately drove back to the villa and found that the firefighters thought it was an accident, and Kawasaki and others were ready to leave the scene together.

"Wait, this is not an accident, but a fire deliberately made by someone!"

Baiyan Zhenyu shouted to the people ready to leave, stretched out his hand and pointed to Kawasaki school, and shouted loudly, "the prisoner is you, Kawasaki school!"

"How is this possible?"

Miyazaki qianxia obviously didn't believe that kaai society was an arsonist. Instead, he asked, "didn't kaai master sing with us when the fire broke out? Moreover, it was so far away from the villa that there was no crime time at all."

"Yes, how could kazui come back to ignite at that time? It's more reliable to say that delayed ignition devices are arranged here, but in that case, it's impossible to deceive the firefighters."

Morimoto Xiyi didn't believe it, but he came to a relatively correct conclusion with the reasoning knowledge he had learned in the community.

In the face of people's doubt, Bai Yan Zhenyu smiled faintly and explained: "yes, there is a delayed ignition device here. The reason why it did not arouse the firefighters' doubt is that it is something that already exists in the house, but the murderer controlled it to ignite the fire from a far place."

Asaka Zhizi was impatient and urged, "then tell me what's going on."

"Sakai Xue, if I'm not wrong, the reason why Miss Ma Mei falls asleep before blowing candles is because you put sleeping pills in her drink?"

Baiyan Zhenyu broke another piece of news. Before everyone asked, he continued: "Later, before we left to sing, you secretly moved the chair to the lower part of the telephone fax machine in the living room, lit the candle on the cake again, and sent a fax to the villa by using the fax machine in the convenience store. The paper printed by the fax machine will be lit by the candle, causing a fire."

"Pop pop."

After listening to Bai Yan Zhenyu's reasoning, kazui Xue applauded and asked without changing his face: "I'm worthy of being a great writer who can write so many novels. My imagination is richer than ours. But if I commit a crime, how can I use such a simple technique? To say the least, even if I use such a technique, what's the evidence? It can't be just your speculation?"

"The simpler the method, the fewer the flaws. From this point of view, it is indeed in line with your identity as president of the reasoning society."

Baiyan Zhenyu didn't panic at all and said faintly, "as for the evidence, I asked the convenience store owner before. You were the only person who used a fax at that time. Of course, you can also say it was a fax sent to others."

Kazui Xue didn't expect that Bai Yan Zhenyu had just gone to the convenience store to inquire about the news. Some beads of sweat appeared on his forehead and explained: "yes, I did send a fax at that time, but it was sent to a friend of mine. He asked me to give a nice name for a novel he recently wrote."

"Hehe, if it's a fax sent to someone, take out the letter sending receipt from the boss. There is time and the fax number of the recipient on it, which is enough to prove that you are the prisoner making the fire. As for the letter sending receipt, I guess you're worried that someone will pick it up if you discard it, so it should still be on you at this time."

Bai yanzhenyu naturally thought that kazui science would not admit it and immediately threw out decisive evidence sufficient to prove his prisoner.

"Then, can we search?" the firefighters felt that Bai yanzhenyu's reasoning was very reasonable and prepared to take the place of the police to search Kawasaki school.

"Don't touch me!"

Sakai Xuexue stopped the firefighters' action, slowly took out the letter receipt crumpled into a ball from his clothes pocket, and mocked himself: "I'm so stupid. If I knew so, I shouldn't worry about small actions being found by you. Just throw this thing directly into the fire."

"President!"

Seeing Masai Xue admit his crime, everyone looked at him with a complex look. They couldn't believe he would do such a thing.

Asaka Zhizi angrily looked at kazui school and asked, "kazui, why do you do it? Don't you like Ma Mei?"

"That's why I hope she can notice me."

Kazui Xue sighed and explained: "last month I wanted to associate with her, but she refused. I've never touched such a thing in the past. Of course, I won't be reconciled. I thought it would only cause a small fire and a heroic bridge to save the United States. I didn't expect the fire to burn too fast..."

"Fool! What do you mean? You can control the fire?"

Bai yanzhenyu sneered and interrupted: "can you use your brain? In case of accidents such as a flat tire on the road and a road jam caused by a landslide, we won't come back so smoothly. Miss Ma Mei may have no life! This selfish practice of ignoring other people's lives also wants others to change their mind?"

After that, as in the past, this incident ended with kazui school being taken to the police station by firefighters. After Bai yanzhenyu and others went to the hospital to see Naomi Uchida, they returned to Maori office with Xiaolan and Conan.