"What's going on?" Frightened by the sudden opening of the rooftop door, Qian Yu hurriedly withdrew his hand and looked at the cloth wrapped around the railing in surprise - the area of the cloth was quite large, covering a large area of the railing.

"......" Gray Yuan Ai also frowned, and subconsciously glanced at the stairs they were walking behind him.

"It seems to be an automaton," Chiba focused her gaze on the cloth, and immediately came to a conclusion. "Shall we go and see?"

There seems to be a rather wide protrusion underneath the cloth, and given the appearance of the rooftop gate when it was opened, it is probably a rotating structure resembling a wheel axle. As soon as they open the rooftop door, something like a sturdy line like a fishing line that was originally tied to the doorknob will be driven open by a weight at the other end.

"Are you sure there's no one on the rooftop?" Gray Yuan reminded uneasily.

"There shouldn't be anyone," Qian Yu shook her head. "It's an automatic mechanism, and if anyone is really here, there's no need for him to set it up."

Despite saying this, Chiba still took out the Traceless Umbrella and prepared for battle. "You stand back a little."

[Is it another way to break through a door when there may be a potential enemy?] Chiba pursed her lips - the floor on the rooftop would be sliding and her knees would hurt. (Chapter 43, Qian Yu rushed to the door by kneeling in Yiyu Building)

But now that he has an assist unit, maybe his reflexes will give him room to choose a less uncomfortable position?

Just as Chiba was ready to break in in a fighting stance, Chiba suddenly noticed that the cloth that was originally covered with the railing had been pulled from below, and suddenly began to fall to the ground under the drive of natural gravity.

A few seconds later, a loud collision sound came from outside into the ears of Chiba and Gray Plains who were standing in the doorway, followed by long and short exclamations.

"Tsk!" Qian Yu immediately reacted to what was happening, and then as if he was sure that no one would be here, he passed through the door and stepped onto the floor of the rooftop.

There was only one way to explain this - the way they opened the door just now triggered a mechanism hidden under the fabric, which then dropped a heavy object. Such a mechanism would be a good way to throw the blame for dropping this heavy object to the person who triggered it.

So, what was it that he threw down and intended to put the Thousand Feathers on their backs? Thinking so, Chiba came to the railing and looked down. As the scene below came into his eyes through the auxiliary unit, Qianyu's originally plain expression was immediately dyed with a trace of solemnity. "Hmm............"

Directly below, a person was lying on the engine cover of a car downstairs, the engine cover had been deformed to a certain extent due to the high-intensity impact, and the person himself had been damaged after the impact, and the blood was rapidly spreading around him. Judging by the situation, he should have been dead - Chiba didn't even need to judge from the fact that he didn't scream in pain from falling, because he had a knife stuck in his chest, and a blood streak extended from the blade, pulling about ten centimeters out of the corpse's leg.

"What's wrong?" At this moment, Gray Yuan Wai walked over and asked.

"Someone fell to their death—a corpse fell to be exact," Qian Yu said, turning his head and looking into Gray Yuan's mourning eyes. "Someone killed a man and hid under the cloth. When the unlucky guy opens the door, the trap will be triggered, and the corpse that was originally fixed here will be thrown down. ”

"So we should call the police now?" With that, Gray Yuan took out his phone.

"Maybe it's not necessary," Qian Yu shook her head. "I forgot to mention that the body smashed into a police car with police officers, I guess—"

Chiba stopped speaking abruptly as his auxiliary unit separated from the sound coming from the staircase—the sound of a staircase door being violently pushed open. Judging by the sound of the staircase door colliding with the wall afterwards, the comer's speed was quite desperate, and it was likely that it was coming at them.

Could it be that the police car is equipped with all the other police forces other than the person in the car are in the building? Could it be that something is going on in this building?

As the sound of stamping on the stairs grew louder and louder, people who were both expected and unexpected appeared in front of them.

It was said that it was expected, because the other party did say what Qian Yu could expect.

"Little children? Uh, you guys pushed the guy who just fell down? Or was there any adult here just now? When he said this, the other party had a fairly pronounced accent.

But unexpectedly...

"You—" Chiba turned and leaned against the railing, raising an eyebrow at the comer. Are you a police officer? If we don't have a police uniform or police officer ID, it's very difficult for us to judge. ”

Standing at the door of the rooftop was a dark-skinned young man dressed in casual clothes. If Qianyu's estimation of the other party's voice and skin is correct, the other party's age should still be in high school, and it shouldn't be a legitimate police officer...

If you consider the worst-case scenario, the other party may actually be a murderer, and now you want to enjoy your masterpiece.

"Are you a child of a Kanto family?" The young man's brows furrowed. "What about your parents?"

At this moment, both Chiba and Gray Plains had a ghostly look on their faces—not because of this child, of course, who might be even more immature than the two of them, but because...

"Thousand Feathers, Gray Plains?" Behind the young man, a panting Conan's eyes widened as he looked at Chiba and Ashbara. "Why are you here?"

"Why are you here?" Qian Yu was stunned for a moment before he reacted. "Wait a minute, did Uncle Maori bring your family to Osaka?"

"You know them?" The young man turned his head and looked at Conan.

"Yes, they're my classmates, members of the Junior Detective Corps. The boy is Tachibana Chiba, and the girl is called Gray Plains. Conan said, suddenly remembering that he had to introduce Chiba and Gray Yuan Ai. Ah, this piece of black - this healthy-skinned brother is Heiji Hattori, a very famous detective in Kansai. ”

"What did you just call me?" Heiji Hattori turned his head unkindly and said to Conan. "I think I'm hearing something that makes a little boy who wears glasses and owes a few more bags on his head?"

"I just called you 'handsome and healthy big brother sunshine'~" Conan immediately put on a smiling face and said flatteringly.

"Don't talk about that yet," Hattori Heiji glared at Conan angrily, and then looked back at Chiwa and the others. "Tell me, what's going on?"