The whizzing police car stopped in front of a convenience store in Kakutocho, and by the time Nao and the others arrived, it was already cordoned off. The crowd at the supermarket had been dispersed, and the unknown people looked curiously at the small shop inside the cordon. Nao, Mukai, and Shishido ran closer, and they were greeted by a huge cabinet-shaped tool cart parked outside the police cordon and a black-and-white police car with the inscription "Cup 1 - Metropolitan Police Department".

"It seems that something is really happening! So many police cars are gathered here, I'm afraid it's not an ordinary small incident!" Xiang Ri's voice seemed to be a little excited, and he kept looking inward on tiptoe, "I don't know if it's a robbery or a murder?"

"Whether it's a small event or a big event, you shouldn't be so happy......" Shishido shook his head helplessly, and grabbed the constantly jumping Xiangsun, "I've seen it, let's hurry up and buy sandwiches and go to the stadium, otherwise today's training will be in vain!"

"Wait a little longer, wait another five minutes!" Although Xiang Ri stopped jumping, his eyes were still firmly glued to the transparent automatic door of the store, and he stretched out his hand to pull Nao, who had been silent since he arrived at the scene, "It's the first time I've seen such a small store and so many police cars need to be dispatched! In the past, even if I saw a police car, it was a police officer who sent lost children home and adjusted neighborhood relations. You say yes, Nao!"

"Ahh ”

Nao answered him randomly, but he didn't hear what he was saying at all. Because her mind began to wander when she saw the cabinet-shaped tool cart with "SB-1" printed on it, and she frowned slightly.

"SB-1" is the abbreviation of the Security Bureau of the Metropolitan Police Department. The 1st Garrison Division has a special assault unit for counter-terrorism and hostage rescue, a special vehicle unit for dealing with heavy armed crimes, and a mobile unit numbered 1 to 9, including a guard of honor, a gun weapon countermeasure unit, an explosive ordnance disposal team, and various rescue teams. And Nao's cousin and guardian, Matsuda Jinpei, is the police officer of this security section. Although she didn't ask what department Jinpei was in, and her relationship with him was not as close as that of Nazu and grandmother, when she saw the word "SB-1", Matsuda Jinpei's appearance involuntarily came to mind. However, the cases that require the dispatch of the security department are generally not trivial, and it is said that Matsuda Jinhei is a prominent figure in the first security class, so he should not be involved in the case that occurs at such a small convenience store.

"You guys, don't gather around here!" a police officer who was in charge of evacuating the crowd and blocking the road walked up and said to the three people who were only two or three meters away from the police car: "What if there is danger?

"Now, what's going on?" Xiang Ri saw that a police officer was coming, so he stepped forward and asked, "Is it a crime? murder, robbery, or what?"

"No matter what kind of incident it is, it's not what a child should care about......," a slightly lazy but stern voice came, and the police officer who turned back when he heard the voice saluted the visitor and stepped aside. The man who walked towards the three of Nao suddenly paused, and the thin lips holding the cigarette lightly raised an arc: "Oh, little girl Nao?"

"Why are you here?" Nao had just dismissed the conjecture that Jinhei would appear in her mind, and such a big living person appeared in front of her, which really startled her, and she couldn't help but add: "What happened here and you need to solve it?"

"Can this be considered a compliment to me?" Matsuda Jinpei smiled and threw the cigarette in the ashtray he carried with him, and gave a thumbs up and compared it back: "It's just a suspected incident, and the advance team is still investigating." As for me...... I was too bored in the office, so I applied to go out and walk. ”

"Who believes it......" Nao couldn't help but roll her eyes as she listened to his explanation. How could something like being bored in the office happen to a workaholic, who doesn't stop going out every day and don't have to rest on weekends! She looked at the flickering figures in the convenience store, then at the tool cart with "SB-1" printed on it, and asked Matsuda suspiciously, "Aren't you a police officer from the Security Department, there is an incident here that requires the Security Department to be dispatched?" Even if it is a murder or robbery, only the Criminal Department needs to be dispatched, right?"

"I know a lot about the composition of the Metropolitan Police Department, and I deserve to be the daughter of a police family!"

"If you want to talk about police, only you and the deceased grandfather Matsuda are you?" Nao was a little puzzled: "These things were taught to me by my father when I was a child, but he is not a policeman, and neither is my grandmother and grandfather, so it can't be said that it is a police family, right?"

Matsuda didn't speak, just looked at her steadily. When he found out that the doubts in her eyes were true, the eyes hidden under the sunglasses narrowed, and he smiled softly: "Stupid, don't forget that you are now the daughter of our family." Since my father and I are both police officers, of course you are also the daughter of a police family. But even if you and your father are of the same generation, and you are your guardian, you can also be regarded as the granddaughter of a police family!"

“…… I said you...... "Nao is detached, is this okay? Matsuda is only twelve years older than himself, so wouldn't he be his daughter if he said that......?"

"Captain Matsuda, the suspicion has been ruled out as a bomb!"

Just as Matsuda was smiling happily, Shishido and Mukai were listening, and Nao was depressed, a police officer in a blue uniform walked towards them with a giant tennis ball in his hand.

"Wow, there are such fun things in this store!" "Xiang Ri looked at the suspicious object in the policeman's hand with wide eyes, and dragged Shishito beside him: "Such a big tennis ball, it should be an exhibit, right?"

"Uh, it's a big ...... indeed"

Shishido's eyes hadn't left the tennis ball for a moment since it was taken out, because it was so special. Although there are large tennis balls advertised for tennis brands in sports stores, they are usually the size of a bowl, and this obviously exhibit is the size of a basketball! Just by the yellow fluff that covers the surface of the ball and the small and well-proportioned holes hidden under the fluff, the tennis boy can tell that this huge ball is made of a very high-quality material.

"This is the suspicion in this ball?" Matsuda Jinpei reached out and took the huge tennis ball, peeling off the sphere that had been cut by the police officers. As he moved, a clockwork alarm clock with several red tubes tied to it was revealed. He smacked lightly, raised his arm and looked at his watch: "Hey, it seems that it's just a prank, and it's been delayed here for so long...... Sue them, we can take the team. ”

"Yes!" the officer saluted, turning to walk toward the store.

"Wait!" Matsuda suddenly stopped him: "Have you already asked the clerk? The origin of this ball, the suspect's clues, have you received a threatening letter or something?"

"Yes, I asked. The police officer opened the notebook in his breast pocket: "The tennis ball is a promotional material sent by the salesman of the manufacturer, and it was placed in the store two days ago." During the two days of the exhibition, nothing unusual occurred, and no clerk was aware of anything inside. The search section had been checked, and there were no suspicious figures on the surveillance tapes, and although some customers had touched the tennis ball, no one had taken it down. But the convenience store is not open 24 hours a day, and when it closes at night, all power is cut off, and the surveillance tapes do not capture the night. ”

"First Discoverer?"

"Here it is. The teenager, who had been standing beside the police officer and watching the crowd interact with great interest, raised his hand, "I found it." ”

Nao hadn't noticed the boy with the tennis bag before turning her attention to him after he had spoken. The teenager wears a white long-sleeved shirt and gray casual pants. The pigtails at the back of his head drooped over his shoulders, gently sweeping the corners of his lips that overflowed with a wicked smile. The neckline under the short silver hair was unbuttoned two or three times, revealing a fair neck and thin collarbones. His back was slightly arched, and his right hand was in his trouser pocket. Just looking at it like this, Nao was lazy and drowsy, but when he gently rolled his eyes and inadvertently intersected with Nao, her green eyes made her suddenly cold and instantly sober.

There are very few people who can make themselves notice just by this glance, and this person is different and seems too special. The evil spirit of the Peace Ancient Field is different, and the coldness of obsession is different, and it is very different from the sunshine of the sun and the softness of Shishido. The handsome appearance is dangerous, like throwing an ice cube into a warm cup of tea, and then drinking it, the two temperatures merge and entangle in the mouth.

(Is it cold or hot?)

Nao suddenly wanted to ask this question in his heart, and was startled by his own thoughts.

"Although I should have already made a record of what happened, I would like you to tell it again. ”

Matsuda's voice interrupted the intersection of golden green and turquoise, and also interrupted Nao's thoughts. The silver-haired boy turned his head with the corners of his mouth bent, and Nao noticed the small black mole at the corner of his lips.

"I found it when I was picking up wristbands in the sports area of the store, and the ball was on top of the wrist rack with a one-man tennis racket hanging next to it. At 11:45 a.m., the sound of a clockwork alarm went off in the ball, and when the sound stopped, I listened closely and heard the sound of the hands moving. There weren't many people in the store at that time, and there was no music, so I could hear it clearly. I asked the clerk and made sure it wasn't a chime ball and called the police. The boy spread his hands, "That's all." ”

"Oh, I remember the time very well. Matsuda lowered his head and glanced at him through the gap in his sunglasses.

"Of course, the first reaction of ordinary people when they hear this sound is to look at their watch, poof!" The silver-haired boy played with his pigtails and smiled at Matsuda.

"Don't be angry, I didn't suspect anything. Matsuda grinned and waved his hand, then turned to the police officer next to him and asked, "What about the store door and the back door, are there any traces of being pried?"

"None of them. ”

"Heh, is that really the case......" Matsuda chuckled meaninglessly, threw the ball into Nao's hand without raising his head, then took out the notebook on his chest and wrote something, then tore off the note with the text written on it and handed it to the officer: "Give this to the person who searched for a lesson, and then we'll close the team." ”

"Ah, yes. The officer took the note, saluted, and turned to run away.

Nao, who caught the huge tennis ball in the unknown air, blinked, and seeing that Matsuda didn't say anything, he and the two people next to him looked at the fake bomb in the tennis ball. This so-called "bomb" is made up of a real clockwork alarm clock and a few red plastic rods, which at first glance looks quite like that. The alarm clock didn't stop, the hands pointed to 11:56, and they were still walking.

"It's coming. Nao looked at the dial of this alarm clock, and raised his hand to look at his watch again, "It's a full 15 minutes faster, does it have any special meaning?"

"Oops, it's worthy of the observant little girl Nao, who found out so quickly. Matsuda took out a cigarette from his cigarette case and lit it, and said with a smile, "What do you think about this 15 minutes? There is still some time before the team closes, think about it." ”

"Maybe the prisoner didn't pay attention, or is there something wrong with the watch itself?" Nao lowered his head and didn't speak, but Xiang Ri answered. He dragged his chin and thought, "But it has a special meaning...... Isn't it just a watch, is that really such a thing?"

"Hmm...... Hey, I can't think of it!" Shishido raised his hand to announce his withdrawal, "I'm not good at this, I'm passing." ”

"Since it's not a real bomb, and it's fifteen minutes faster, if it really makes sense, it's to highlight the number '15'!" The first discoverer on the side suddenly spoke: "If this number is meaningful, then it is probably what makes sense to hide it in this tennis ball!"

"Whew...... Not bad, go ahead. Matsuda blew out a smoke ring with a "I know, I just don't tell you" expression, "Then again, did you all learn English at school?"

"I didn't study elementary school in Okinawa, but my friend's mother is an English translator and learned some when I came to his house to play. Nao said casually, and suddenly paused and looked up at Jinping suddenly, his golden green eyes shining: "...... It can't be like that, right? But what's the meaning of that number? And the 'NIS' at the end. As she spoke, her voice lowered again, apparently lost in thought again.

"Oh, have you thought of this?" Matsuda narrowed his eyes as he looked at Nao's suddenly realized expression, "Just a hint, NIS is an abbreviation for the National Intelligence Service, but it is used here in a different meaning. - Notstock, no inventory, no goods. ”

"Hmph, I see. ”

"It's easy!"

Crisp and lazy, two different voices overlapped. Both of them looked up in amazement, looking at each other with a little appreciation and recognition in their eyes.

"Figured it out?" Matsuda tossed the cigarette butt into the ashbox he was carrying, and moved his fingers to look at Nao and the silver-haired boy who seemed to have understood the mystery, "Don't worry too much about the meaning of that message, the rest is the work of searching for a lesson." ”

"But I haven't figured it out yet!!What the hell is the point of that 15!!" Xiangri jumped a little, and Shishido nodded in agreement.

"Then, let's let Nao tell you, I'm going to close the team too. Matsuda Jinpei completely lost the interest that had just let a few people reason, and yawned heavily. As if thinking of something, he turned his head to the first discoverer boy and said, "By the way, you can leave after leaving your contact information, and someone will call you in the afternoon to inform you to go to the bureau to make a record." ”

"I'm afraid this is a bit difficult, my home is still far from here, can't I make a transcript now?"

"Far away, in another county?" Matsuda nodded and turned his gaze to Nao, who shuddered at the sight of his strange eyes peeking through behind his sunglasses. Jinping pulled Nao over, put his arm on her shoulder, and smiled at the silver-haired boy: "Then let's take the proud little girl Nao to take you around, the time for writing will come in a while! Please, Nao, remember to remind my mother to let her make chestnut soup at night! I'll go first." With that, he waved his hand and walked away, not giving everyone any time to react at all.

"Hey, this is your Metropolitan Police Department's business, right?!" Nao looked at Jinping's back and lowered her face, although she was unwilling, she always felt that she had a good impression of Zhanping, and she didn't refuse, but sighed and shrugged her shoulders at the silver-haired boy: "That's it...... Of course, it's okay if you want to go alone. ”

"Crack, there's really no way...... "The silver-haired young man tightened the bag on his shoulders, squinted his eyes and made an inexplicable voice, and bent his lips at Nao: "Nioh Masaharu, because my home is in the distant Kanagawa, so please give me more advice in the afternoon." ”

"Is Kanagawa far away?" Nao couldn't help but laugh when she heard the young man's ridiculous tone, turned to face him and said, "Saotome Nao, although I'm not very familiar with Tokyo, let me take you around in the afternoon." ”

"One from Kanagawa, one from Okinawa...... The two of them will definitely get lost......"

"Nao, what is the answer to that reasoning just now!!"

Shishido and Mukai, who had been ignored for a long time, were gloating and whispering on the sidelines, while the other screamed in a frenzy.