"The victim is Okazaki Chengjiang, 39 years old, the cause of death was suffocation by strangulation of the neck, judging from the bleeding, it is the same as the previous three murders, it was after being strangled that the chest was inserted into the chest! When was the body found? ”

"Three or four minutes before you came, the discoverer was this uncle who cleaned the toilet, and he found it in the tool room!"

"Really? It seems that the murderer killed her before us! What an abomination! That's pretty much! Hearing Heiji's helpless sigh, Sakata, who was squatting next to the corpse, also shouted unwillingly.

However, Yuichi, who had already decided to intervene in this case, would no longer play soy sauce like before, and squatted next to Okazaki Chenge's corpse before the Osaka police came, looking at the corpse and reasoning.

"Is there any secret to why the murderer has to pierce the chest with a knife and a wallet every time he strangles the victim to death? And apparently she had just told her to lock the doors and windows and not to come out before the police came, so what was the reason for her to leave her home and come to this remote toilet because she was afraid of death? There must be some connection in this that we don't know about! The breakthrough should be on this wallet. ”

Thinking of this, Yuichi, who didn't speak much about the case along the way, coughed and attracted the attention of Heiji and Yusuke Sakata.

"What was in the wallet of the deceased who pierced the deceased, did you Osaka police know about it?"

"Ahh Actually, there is nothing! It's some banknotes, business cards and other miscellaneous items, and by the way, a driver's license that can prove their identity. ”

"Driver's license? Don't have an ID card or anything like that? ”

"Nope! We understand that their information is all from their driver's licenses! Officer Yuichi's statement did make me a little confused, all the hard clutter in the wallet was thrown away, except for paper money and other things that are easy to pierce, there is only this driver's license! ”

"That's right! This is the detection point of this serial murder case, maybe we can check it from this aspect! ”

"Really? Then let's go to the Kadoma Driving Supervision Office! You should be able to find it there! After handing over the scene to the Osaka police who were in a hurry, Heiji, who felt that he had regained the clues, pulled Yuichi, Sakata and others hurriedly ran towards the Toyota car rented by Sakata outside the community.

"Flat! Then aren't we going to the village councilor's house? Sakata, who was dragged to the driver's seat, asked strangely as he adjusted his rearview mirror.

"Not going! Although the first victim, Nagao, and the third victim, Noyasu, have a relationship with him, Nishiguchi, who was killed second, and Okazaki, who was killed just now, seem to have nothing to do with him! It's useless to go to him now, what we need now is an intersection that can decipher the existence of these people with different identities and no intersection! Just find this and everything else will be done! ”

"I see? Then let's go to the driving supervision office! Sakata, who was ready to drive, turned on his turn signal and stepped on the accelerator to leave the Nishito apartment.

"None of these four have a criminal record? It seems that it has nothing to do with driving runaways, car accidents or anything! So where will the problem be? Is it hard to get a driver's license? ”

"No, no, no! The driver's license is not right either! The year and location of the driver's license test are different for each of them! ”

"Indeed! Everyone else got their driver's licenses in Osaka, but Okazaki was the only one who took classes at the Hyogo Coaching Ground! ”

"Huh? Hyogo Coaching Ground? The driving classes there are cheap and famous! ”

"Together?"

Yuichi and the others, who were discussing the driver's license issue, were suddenly all looked at each other with a sharp eye after being interjected by the administrator in charge here, and the driver's license is not something that can be tested once, especially for female drivers like Nishiguchi and many generations, it is not uncommon for them to take the test several times, although among the four people, it is Okazaki, who is a lady, who has taken the driver's license, but this possibility cannot be ruled out.

Sure enough, not long after, after contacting the Hyogo training ground, Yusuke Sakata, who was full of excitement, ran back with his mobile phone.

"Good news! Okazaki Sumie and Nishiguchi Tayo had indeed participated in dormitory training there, and they were roommates in the same room at the time! And Hidetoshi Nagao and Kazuto Noyasu, who we had been in contact with before, as well as Sotaro Goji, who we were going to visit, also participated in the driving class 20 years ago! ”

"What? They actually all stayed there together, so it makes sense! It turns out that the intersection of several of them is here! Looks like we're going to have to go to Councillor Township's house today, no matter what! After all, this kind of serial murder incident that knows the names and social relationships of all the victims, as long as they find a common connection between them, it will be much easier to solve this kind of case.

"Wait! Peaceful! I have more exciting news for you than this news! It could put your life at risk, so I have to tell you! ”

"What's the news?"

"There was another person in the dormitory class at that time, and his name was Jiichiro Numabuchi!"

"Jiichiro Numabuchi? That wanted criminal who is currently wanted across the country? ”

"That's right! I think it should be him! After all, such a special name can only be him, right? ”

"No! I'll have to confirm it myself! Call me! Feed! Is it the Hyogo Coaching Ground? Do you have any photos of the students there? What the? Have a photo of them? That's great! Send me a fax! Thank you! ”

Just after revealing the important news of Numabuchi Jiichiro to Heiji, before Sakata could react, Heiji, who was quite concerned about this matter, anxiously snatched the phone in his hand and called back according to the communication record.

Yuichi, who was looking at all this in front of him, turned his eyes around Heiji and Sakata a few times, and smiled mysteriously.

"Maybe I know a little bit about who the killer is! It's a bit incredible, though! But after excluding all personal feelings, contact all kinds of things along the way! That person's suspicion is getting bigger and bigger! In particular, the two strange voice-changing messages left in Okazaki Chengjiang's room, which made her go to the scene to watch the show, were only possible for those who were present at the time. So who could this person be? From going to a restaurant at Okonomiyaki to just driving past the Nishito apartment, and then giving me information about my driver's license, and now a murderer wanted nationwide among the dormitory trainees at the Hyogo Training Ground. Although all this seems to be accidental, when all this chance comes together, there are only two words in my eyes! That's murder! It seems that his plan is to make this Numabuchi Jiichiro carry the black cauldron! I already know the murderer's tricks, but what about his motives? What is his purpose in quietly promoting all this? ”

Just as Yuichi lowered his head and pondered, the group photo from the Hyogo Coaching Field was also faxed, and Yuichi, who saw the fax photo, finally couldn't help laughing, and he may have understood the murderer's motive for killing.