Quiet campus, decaying old school building.

There was still a lot of noise at the door of the biology classroom in the distance, with fierce banging on the door mixed with various shouts.

"Can't open it, where's the key?" Kindaichi turned the door lock hard and shouted to Tachibana Ryozou who was following behind.

"If there was a key, would this still be a biology classroom that couldn't be opened?" the latter responded anxiously.

"Damn it!" Kindaichi turned the door lock to no avail and began to hit the heavy wooden door with his back.

"What's wrong?" Makoto Makabe, who was called by the magician after school, arrived late and followed the sound.

"Makabe-senpai! Sakura-senpai was hung up by the 'after school magician'!"

"Magician after school?" Makabe Makoto, who had just arrived here, still didn't understand the situation.

At this time, Nanase Miyuki, Ogami Takahiro, and Takashi Yudai arrived one after another.

…

The blazing yellow tungsten light flickered. Saoki turned on the light, held an ink umbrella, and sat alone on the chair in front of the old computer, turning a deaf ear to everything happening in the outside world.

"According to the logic in the anime, after Sakura-senpai solved the six unsolved mysteries of the academy, the ground suddenly shook. The posters on the old cement wall were squeezed away by the damaged wall, and the exposed large hole revealed a thousand green mountains.

She learned the truth about the seventh unsolved mystery and stored the truth in Roman letters on the hard drive." She shined the flashlight forward and saw that the square hard drive was still plugged into the bulky host.

There was no rush to get it, and Onoue Takahiro was later beaten to death by the murderer for unlocking the password in the hard drive.

"So, since it's not the wall where the poster is damaged, could it be some other wall in the classroom?" He looked around the entire classroom, and finally focused on the wall with the calendar hanging on it, "Except for the poster,

This side, that's where it's more suspicious."

Saoki's eyes were shining, he stood up and walked to the calendar, stroking his chin with his slender fingers. He first observed the ground under Fukamu's waistline, "The ground is very clean, and all the fallen gravel should have been cleared away.

"

Then, his eyes moved upward. The surface of the eighty centimeter high and half meter wide calendar was glowing with light yellow. There was a semicircular wire ring on the top, hanging on a rusty iron nail.

"It seems that there is no change from what I saw in the afternoon." Saoki thought about it and took out the rubber gloves from his pocket, put them on, stretched out his hands, and prepared to remove the entire frame with the calendar stuffed in it, but found that the latter did not move at all.

"How is that possible?" Confused, he stopped, held up his glasses, and carefully observed the surroundings of the frame again. Finally, he noticed that there were two silver nails nailed in the middle of the two sides of the frame. The round surfaces of the nails

It's not big, and the color is mixed with the off-white frame, making it difficult to see.

"Looking at the color, there is no rust at all. It is very likely that the murderer nailed it just after attacking Sakura-senpai." Sagi used the index fingers of his left and right hands to scratch the frame surface near the nail and the unnailed bottom.

On the frame surface with nails, the depth of the dust lines on the two index fingers is obviously different.

"Stay close to each other." He had no idea of ​​prying open the nails to investigate. If Yuichiro Ba knew about it, he would definitely be suspicious of him staying alone in this classroom.

"Anyway, there is a free backtracking skill, so don't use it in vain." Saoki thought, and returned to the chair in front of the computer. With the chair as the center, he opened the ink umbrella with a "crash", and the light above his head was instantly blocked by the dark umbrella.

His face was absorbed, and his body was shrouded in shadow.

"Before the earthquake, Sakura-senpai was still sitting on the chair. Even if she got off the chair and squatted down, she would not run too far when she was panicking. As for the time of the earthquake, it was two minutes past 7 o'clock, which is 2 minutes away.

Now..." Zuomu glanced at the watch on his wrist, "Two and a half hours."

Saoki opened the dark green panel of Mo Umbrella in his mind and entered the rotation degree in the input field: 37.5. After testing in the past few days, he discovered some functions related to Mo Umbrella, such as the degree input field. After entering the degree,

, the ink umbrella will automatically rotate the corresponding degree, allowing it to accurately control the time point of the backtracking, but the rotation degree range is 0~360 degrees, which means that it can only backtrack to any time point within a day.

He paid a price of two detective points to activate this function, so the current detective value slot is only four points. He is temporarily unable to do other functions.

Suppressing the complaints about the ink umbrella system in his heart, Saoki followed the input confirmation of the rotation degree, and the cold umbrella handle held in his hand turned slightly. After stopping, Saoki gently pulled it down and silently said "Look back".

The light was overflowing under the umbrella, and the turbulence of time and space flowed through his fingers. No matter how many times he experienced it, Saoki couldn't help but marvel at the wonder of this thing.

The three-dimensional image is frozen. On the left hand side of the chair, a group of human-shaped pixels is frozen. "Senpa Sakura" is half-hunched over, with waterfalls of black hair hanging down her back. Her white right hand covers her "O" shaped mouth.

Her fear and surprise can be imagined. As for her figure, she was facing the side of the calendar.

After receiving the expected answer, Zuomu sighed softly. This blurred and stiff face was vividly displayed in front of him a few hours ago. He had a good impression of his senior sister and tried to save her.

But to no avail.

"Peng", the thick dark wooden door of the biology classroom was finally pushed open by everyone, and a musty smell of wood assaulted the nostrils. Without the scene that Kindaichi, Nanase Miyuki and others saw earlier, the biology classroom was empty.

The magician in a strange mask and holding an object, the burning candle arranged in the shape of a six-pointed star, and... Sakura-senpai hanging on the six-pointed star. All of these disappeared before everyone's eyes like a dream.

"Bodies and candles have disappeared." Kindaichi stared blankly at the empty classroom.

"How could this happen? I saw it with my own eyes!" Tachibana Ryozo said firmly.

"They were all locked from the inside, not through the window, and in such a short period of time..." Kindaichi was still in disbelief.

"What about that scene we saw earlier?"

"It really feels like the seven mysteries?" Onoue Takahiro swallowed, "A corpse disappeared from the biology classroom that couldn't be opened."

Everyone turned to look at him in unison, and the atmosphere at the scene became even colder and weirder.

"Don't say unreasonable things..." Nanase Miyuki said half-crying.

"By the way... where is Sagi-kun?" Onoue Takahiro asked doubtfully.

"Teacher Chang, whom I met on the way, was going to rush here with me, but then he saw a strange light beam in the classroom of the Occult Research Club. He was afraid that some strange person had sneaked into the school, so he went to investigate.

." Makoto Makabe said.

"Sagi-kun should still be in the classroom of the Mysterious Research Club." Takashima Yuyo said calmly.

Tightening the ink umbrella, Saoki bent down and took away the square hard drive plugged into the case. "Bang", turned off the light, the hot tungsten wire was still red. The classroom returned to darkness, he turned on the flashlight, ready to go to the biology classroom and

The large army assembles.

The moment he took the step out of the classroom, Saoki's face suddenly turned pale.
Chapter completed!