When a group of people returned to the agreed meeting point with a stag beetle in hand, the teachers were amazed by their fruitful results.

"How did you do it? You caught so many stag beetles so quickly!"

“The kids are amazing!”

"They actually caught so many!" Some student teams who were already satisfied with catching one were also jealous of Conan and others' gains.

"It's amazing!"

"Conan, how did you get so many stag beetles?"

"Conan," Qianyu looked at the stag beetle held between his thumb and forefinger and curled his lips. "Is there any container that can put this thing?"

"Qianyu-kun, I have a plastic box here, you can put it in!" Ayumi took out a small box from her pocket and put her stag beetle in it. Then, she used her free hands to take out a plastic box from her backpack

box, signaling Qianyu to put the stag beetle inside.

"Huh..." Qianyu put the stag beetle in like a plague god. "Finally..."

"You don't like bugs very much!" Mitsuhiko looked at Qianyu's expression and curled his lips.

"No way?" Qian Yu rolled his eyes.

"Ha~" Haiyuan Ai's chuckle revitalized the atmosphere that had been suppressed by Qian Yu's white eyes.

"Hahahaha——" Everyone laughed one after another.

"..." Qian Yu was speechless and held her forehead.

"It's not lunch time yet," Teacher Xiaolin asked with a smile. "Children, would you mind playing a little longer? We will have dinner together at 12:30, just come back before then!"

"Yes!" Both willing and unwilling voices sounded together.

...

"Do we have to go down the mountain?" Qianyu asked a little strangely, following Mitsuhiko who was leading the way.

"We have been on the mountain for so long just now, why don't we go down and have a look?" Mitsuhiko turned around and asked. "The scenery down there is actually pretty good!"

"Okay..." Qianyu glanced at the scenery below - at the foot of the mountain, a clear lake was emitting dazzling light under the sun.

...

At around 11 o'clock, the group arrived at the lake.

"I'm afraid we don't have enough time to play here," Qianyu glanced at his watch and frowned. "It actually takes 20 minutes to get down to the lake, and it probably takes 40 minutes to go up the mountain... If you want to arrive before 12:30

When we go back, we can only play here for half an hour at most."

"It's okay, it's okay!" Mitsuhiko immediately ran to the lake and took a sip of water with his hands. "It looks drinkable!"

"There's no need to drink it, right?" Qianyu frowned. "This is not a water source. If there are any heavy metals..."

"That's right..." Mitsuhiko was startled and quickly let the water in his hand flow back into the lake along the gap.

"However, such tourism resources have not been developed..." Qianyu lowered his head and looked up at the nearby scenery. "It's really interesting..."

"This place itself is a bit remote, so it's not easy to drive, right?" Haiyuan Ai looked around the area. "What's more, this place is full of woods. If you plan to open it, you will have to cut down a lot of trees. I'm afraid this proposal will be difficult to pass.

.”

"What a pity." Qianyu shrugged. At this moment, Qianyu suddenly realized that Ayumi seemed to have discovered something, and stared blankly behind a stone. "What did Ayumi seem to have discovered? I'll go and take a look."

"..." Ayumi was looking at something in the gap between the stones, when Qianyu's voice suddenly appeared behind her.

"What's wrong, Ayumi?"

"Huh?" Ayumi, who was concentrating, was startled at first, and then realized. "It's Qianyu-kun..."

"Did you see anything?" Qianyu asked, casting his gaze where Ayumi's eyes were.

A sealed, somewhat worn plastic bag was stuck in the gap between the ears between two large rocks.

"Who threw it here?" Qianyu walked to the plastic bag and observed. "This bag must have been abandoned here for a long time...Forget it, I will take this bag with me later."

"Qianyu-kun," Ayumi's voice came from behind. "Are you going to take this garbage bag back and throw it into the trash can?"

"Yeah," Qianyu said, picking up the plastic bag, but found that something was wrong with the plastic bag. "Huh?"

This thing is not so much a black plastic bag as it is a black plastic sealed bag. Although it is in a sealed state now and you can't see what's inside, the heavy feeling and the clearly visible spherical drop on the surface of the plastic bag

The objects clearly indicate that there is something unusual inside the plastic bag. With this terrifying density, is it a mechanical product? So heavy, a copper product? A lead product?

"Ayumi," Qianyu turned around and showed the bag to Ayumi. "I think there seems to be something in here. You can step back a little and hide behind the stone."

"Oh..." Ayumi was stunned for a moment, but decided to obey and hid behind a relatively far stone.

"..." Qianyu took a deep breath and opened the plastic sealed bag, but nothing bad happened. Then, Qianyu placed the plastic bag on the ground and poured out the small balls in the bag.

This is a small round bead, slightly smaller than normal checkers marbles, with an earthy dull luster, and unknown stripes tattooed on it - although I always feel that these stripes have some special connection, Qian Yu

But it can't be interpreted.

What's more subtle is that this bead is surprisingly heavy. As a gunsmith who has worked with countless materials, Qianyu is very sure that the density of this bead is much greater than that of lead and copper, and can even rival the density of gold.

Is this gold? Qianyu was even more surprised - even if it was an alloy made of a metal heavier than gold mixed with other metals, it would still be a very valuable thing. Because generally speaking, it is denser than gold.

materials are more expensive than gold.

After Qianyu clarified her thoughts, she checked the plastic bag again and found that there was a booklet inside. After pouring the booklet halfway out of the bag, Qianyu discovered that it was once a black booklet - the reason why it was said that it was once.

, because the cover of this booklet has become worn out for some reason and has almost completely faded.

This bag is definitely not garbage, but something very valuable... Qianyu thought for a moment, put the ball back into the bag, resealed the bag, and put it in his pocket.

"We have no time!" Conan shouted from a distance. "It's time to go back!"
Chapter completed!