As night approached, no one passed by on Teramachi-dori Street facing the Kyoto Imperial Palace. Ayuta Chizuru first looked around, and then passed through the school gate with the words Liuyuan Girls High School written on it.The hands on the watch were pointing to six fifty in the afternoon.At this time, the main door of the school was locked, and only the side door was still open. Passing through the school gate, there is a two-story school building in front of you, which is quite elegant with the combination of east and west.It adopts the Renaissance style of wooden structure.The porch on the front of the building was closed, only the lights in the night duty room and the janitor's room were still on, and the rest of the place was completely dark.Windows and curtains in all rooms are tightly closed, so there is no need to worry about anything being found.There are more than 500 students studying here from the first grade to the fifth grade. This private girls' school, which is second to none in Kyoto Prefecture, has entered the dreamland at this moment.

Chizuru is a fourth-grade student at the girls' school. There was a reason why she had sneaked into her school so late. During lunch break today, Qianzuru read a book called "The Tragedy of X" borrowed from the government library on the willow-lined avenue behind the school building. The author was Barnaby Ross.Although other classmates who love Nobuko Yoshiya frowned at her, she really likes detective novels.Qianhe was addicted to the supernatural powers of the famous detective Jerry Lane in the book, and fell asleep comfortably with the breeze blowing.She didn't wake up until the bell rang at the end of the lunch break, and when she looked around, there was no one around.

Sleepy-eyed Chizuru hurried into the classroom for class, and after school, she went to participate in the club activities of the volleyball club. She didn't arrive home until after 5 o'clock in the evening.After returning to her room, she took off her sailor suit and changed into home clothes of Mingxian silk. When she was about to continue reading "The Tragedy of X", she realized that the book was gone.Where did I forget it?Qianhe thought hard, and finally remembered that when he fell asleep during his lunch break, he left the book under the shade of the willow tree.Look for it early tomorrow morning.But what if the book is gone by then?Even if it is not lost, the book may be damaged if it is wet with the dew in the night.Such an important book borrowed from the library should be lost or damaged... Qianzuru became more and more restless. After eating dinner in a hurry and washing the dishes, she changed into the clothes she was going out. After saying "I'll go for a walk", he rushed out of the house.

From the air, the school building of Liuyuan Girls’ High School looks like a huge E on the east side of the north-south Teramachi-dori Street. The west side of the junction of the E-shaped vertical bar and the horizontal bar in the middle is the front entrance. To the south of the E-shaped building is a wide playground.The shade of the willow tree where Chizuru left the book is to the east of the E-shaped school building. Qianhe entered the campus, she looked at the front entrance and walked to the right.In front of it is the wide playground.Bathed in the bright sunshine of early October during the day, the place is filled with the laughter of girls, but at this time it is shrouded in darkness and empty.Qianhe suddenly felt a little scared, and the hairs on his arms stood on end.She began to regret her reckless behavior.

Get the book early and go home quickly.Chizuru quickened his pace.She turned left at the corner of the school building.Looking to the rows of classrooms on the left, the windows are filled with darkness.Chizuru started to run.Passing the school building, the willow tree shade is in front of you.The place looked extraordinarily dark.The woods, which had been idyllic during the day, now seemed to lurk in the darkness.On the left front is the tree where Chizuru took a nap.There is a rectangular thing looming under the tree. The book is still there.Qianzuru ran over to pick up the book and found that it was neither wet nor damaged.With a sigh of relief, she put "The Tragedy of X" in her handbag.I turned my head and was about to go back, when I realized that the lights in the music classroom were on.

The music classroom is located at the east end of the horizontal bar in the E-shaped school building, and its front can just be seen from under the tree where Chizuru is.Who is there?Is some music teacher practicing?Qianzuru even forgot to be afraid, she approached the music classroom driven by curiosity, and peeped in through the gap in the curtain near her right eye. What appeared in Chizuru's narrow vision was the figure of music teacher Shingo Kimizuka playing the piano.He was wearing a long-sleeved white shirt and navy blue trousers.Because the music classroom has recently undergone a repair project to strengthen the sound insulation, even if you stand outside the window, you can only hear a little sound of the piano, which seems to be Haydn's piano sonata.

Teacher Kimizuka is tall and thin, a bachelor in his thirties.Many students, including Chizuru, don't like him very much.He is very neurotic and always pursues absolute correctness. If he fails to meet the correct standard he set, he will pull his face down and complain non-stop.The same is true for instrumental performance. Regardless of the emotion and expressiveness contained, he only requires absolute accuracy of the music.Music was originally Chizuru's favorite subject, but because of Mr. Kimizuka, she has recently become disliked.Today's second session is music class, because Mr. Junzuka was about 1 minute late when he encountered a municipal tram on the way to work, and he also got angry for a long time about such a trivial matter, and the students couldn't stand it.Because the city tram runs on the ground, there will always be various traffic conditions such as cars and bicycles, so there is nothing you can do if it is a minute late or something?

Mr. Kimizuka suddenly stopped playing the piano.He stood up from the chair and walked towards the door to the left of Chizuru's line of sight.It seemed as if someone was knocking on the door.Mr. Kimizuka opened the door leading to the corridor. Mr. Kimizuka took a few steps back, which shows that someone has entered the room.But who it is remains to be seen.Only the right side of the door can be seen through the gap in the curtain, and the doorknob can't be seen, so let alone the appearance of the visitor, I can't even see the hand holding the doorknob.The door was closed.The visitor seemed to be out of Chizuru's line of sight to the left, but still no one could be seen.Mr. Junzuka, who showed his left side profile, was talking to him.

There was a slight blasting sound, and Mr. Kimizuka's body shook violently.Chizuru felt as if his heart had stopped beating.The explosion sounded again.Mr. Kimizuka shook violently again, and then fell to the floor.He was lying face down with his arms forward, and she couldn't see the left arm below the elbow because it was out of Chizuru's line of sight to the left.The door was opened again, and then closed again. The visitor shot Mr. Junzuka, and the two explosions just now should have been gunshots.Qianhe gradually understood.But the scene seen through the window gap is really not realistic, it seems to be a scene of a shooting event.Maybe it's just acting.But when the gun was fired, the way Kimizuka-sensei shook his body violently didn't look like it was staged anyway.It was not a movement of his own will, but was obviously forced to shake like this by an external force.And after he fell to the ground, his body remained motionless.The teacher was really shot.Chizuru's legs seemed to have no strength, she looked at her watch unconsciously, it was 7:10 at this time.

Be sure to let the night duty room know.Chizuru ran towards the duty room.But her feet didn't work, they became trembling, and she couldn't run fast. The music classroom is located at the east end of the horizontal bar in the middle of the E-shaped school building, and the duty room is below the junction of the middle horizontal bar and the vertical bar. Therefore, if you run along the corridor of the middle horizontal bar, you can go from the music classroom to the duty room. It's not very far either.But now, the doors and windows of the school building are locked, so it is impossible to enter.Qianhe had no choice but to make a big circle from the south of the school building along the route he came from.

It was already 7:12 when she finally ran out of the duty room window.Panting for breath, Chizuru banged on the window vigorously. After a while, the window clanged open, and someone shouted, "Who knocked on the window like that!" English teacher Taifu Hashizume stuck out his upper body.It turned out that Mr. Hashizume was on duty tonight.He is not yet thirty years old, always cheerful, looks like a handsome guy, and pays more attention to his image, so he is quite popular among the students.Tonight he is also wearing a very stylish jacket. "Ah, isn't this Ayuta from Class 3? Why are you still in school at this hour? You were the one who knocked on the window just now?" "Ok." "Why are you doing such a thing..." In the middle of speaking, he seemed to have noticed Qianzuru's face. "What did you do? Your face is so pale?" "I just saw Mr. Junzuka was shot dead in the music classroom." "what happened?" Qianhe told what he saw, and Teacher Hashizume was taken aback, and his expression changed. "Okay, I'll go and have a look." Seeing Teacher Hashizume's upper body retracted into the room, Chizuru said hurriedly. "Ah, teacher, I'll go with you, wait for me." "Fool, how can you still go to the shooting scene? Stay here." "But if I stay here alone, I may be attacked by prisoners." "I really can't do anything about you. Reach out and come in through the window." Chizuru first handed the handbag in through the window, then grabbed Teacher Hashizume's hand, and was pulled into the duty room.If her mother saw her like this, she would probably pass out. Hashizume opened the door to the duty room and turned on the lights in the corridor.The light bulb on the ceiling cast a faint light in the corridor. Under the dim light, the English teacher ran towards the music classroom.Chizuru followed behind him.The two saw a window in the front corridor of the music classroom wide open, and there was a hole about 15 cm in diameter in the glass next to the window lock.The prisoner probably used a glass cutter to open the hole, and then reached in to unlock the window, sneaking into the school building in this way. The two came to the door of the music classroom, Qianhe subconsciously looked at his watch, it was 7:14.Hashizume grabbed the handle to open the door, but it wouldn't open.The door is locked. "—It seems to be locked." Teacher Qiaozuo's face froze when he spoke. "That means the murderer is still inside?" "—If that's the case..." Chizuru felt a cold war in his heart.Originally thought that the murderer had left, but now it seems that he is back.She seemed to feel the breath of the murderer on the other side of the door. "Why don't you go outside like I did just now and look through the gap in the curtain? Maybe you can see the murderer." "Okay, let's do it like this." Teacher Hashizume ran out from the wide open window in the corridor.Chizuru followed closely behind. Hashizume peeked into the music classroom through the gap in the curtains. He seemed to see the corpse of Mr. Kimizuka lying prone on the ground. Looking from the side, his face became severe.Hashizume tried to open the windows again, but none of the windows could be opened.It's also locked here. "...The murderer can't be seen from here. There may be a blind spot." "yes!" "It's okay to break the window glass and open the lock, but the murderer who is hiding may attack again. Go to the back room to get the door lock key. It's better to call other school workers to help." After Hashizume finished speaking, he returned to the corridor from the window again, took Qianzuru's hand again, and pulled her in as well. The back office is located at the north end of the vertical bar of the E-shaped school building.Hashizume and Qianzuru first passed the corridor with the horizontal bar in the middle, and then rushed to the back room from the corridor with the vertical bar.School worker Dojima Genji is in his 50s and has a dark complexion.He has been working in this school for nearly 30 years. Although he looks a little serious, he is very friendly and very popular with students.Seeing Qianhe, he widened his eyes in shock, and then listened to the whole thing. "—Ms. Kimizuka was shot?" Dojima also became serious. "Okay, I'll go too." There are many keys hanging on the wall of the back room, and below it is a sign that says which room it belongs to.Dojima took the key from the wall, and the three returned to the door of the music classroom. Dojima inserted the key into the keyhole and turned it, making a click.Hashizume-sensei held the handle and slowly opened the door of the classroom.Facing the door was the music teacher who fell headfirst on the ground, Chizuru's feet trembled even more.Hashizume knelt down and felt Mr. Junzuka's pulse.After repeated confirmation, he shook his head. "—the person is dead." Then he looked at Dojima, "Let's catch the murderer who broke in." Dojima looked very nervous, he nodded, and the two walked into the music classroom.The next thing you hear is the yelling from the fight with the murderer?Chizuru felt extremely disturbed at this moment.However, nothing happens, and Hashizume and Dojima walk out. "There's no one in there." Hashizume-sensei said in bewilderment as if fascinated by the fox. "what?" "No one is in the music classroom. You can see everything under the table. It's impossible to hide there, and there are no cabinets that can hide people." "Did the murderer escape through the window?" "Probably not. Dojima-sensei and I checked one by one, and the screw switches of all the windows are locked properly." Mr. Hashizume glanced at Dojima and said, "I'm very sorry, but can you please open the door of the principal's office and call the police to report this incident? After that, please take care of this child in the back room. I'll be watching the scene until the police come." "I see." Dojima nodded, and led Chizuru back to the back room.He took down the key to the principal's office hanging on the wall, opened the door and turned on the light. In the center of the luxuriously decorated room is a heavy oak desk with a telephone on it.Dojima picked up the microphone and reported the incident to the police.After finishing the phone call, Dojima took Chizuru back to the back office. About 15 minutes later, the sound of several cars stopping on Teramachi Street outside the school was heard.The police have arrived.After a while, several men's footsteps were heard on the stairs.Opening the door of the back room, the man in his forties showed a surprised expression. "Yo, Chizuru. I was really surprised." "—Uncle!" It was mother's younger brother—Uncle Keisuke.He is a member of the Criminal Division of the Kyoto Prefectural Police Department. As soon as Qianhe saw her uncle's face, she couldn't help but shed tears.