When the group returned to the agreed meeting place with a stag beetle in their hands, the teachers were amazed by their fruitful results.

"How did you do that? So many stag beetles were caught so quickly! ”

"The kids are amazing!"

"They've caught so many!" Some of the student squads who were already satisfied with catching one were also a little jealous of the harvest of Conan and others.

"That's amazing!"

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

"Conan," Chiba pouted as she looked at the stag beetle she was holding between her thumb and forefinger. "Is there any container for this?"

"Qianyu-kun, I have a plastic box here, you can put it!" Ayumi took a small box out of her pocket and put her stag beetle inside. Then, with her free hands, she took out a plastic box from her backpack and motioned for Chiba to put the stag beetle inside.

"Whew..." Chiba placed the stag beetle in like a plague god. "Finally...

"You don't like bugs!" Mitsuhiko looked at Chiha's expression and pursed his lips.

"Can't you?" Thousand feathers with white eyes.

"Heh~" Gray Yuan's chuckle made the atmosphere suppressed by Qianyu's white eyes enliven up again.

"Hahahaha-" Everyone's laughter rang out one after another.

“。。。” Qianyu was speechless and held his forehead.

"It's not lunch yet," Kobayashi asked, smiling. "Kids, mind going play a little longer? We'll have dinner together at 12:30 and be back before then! ”

"Yes!" Cries of reluctance and reluctance rang out together.

。。。

"Do you have to go down?" Following Mitsuhiko, who was leading the way, Chiba asked a little strangely.

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

"Okay... Chiba glanced at the scenery below - at the foot of the mountain, a clear lake was shining brightly in the sun.

。。。

At around 11 o'clock, the group came to this lake.

"I'm afraid we don't have a lot of time to play here," Qian Yu glanced at his watch and frowned. "It takes 20 minutes to get down to this lake, and 40 minutes to go up the mountain... If we want to go back before 12:30, 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 in his hand. "Looks like it's drinkable!"

"There's no need to drink it, right?" Qian Yu frowned. "It's not a water source either, in case there's any heavy metals...

"Oh, too..." Mitsuhiko was startled, and hurriedly let the water in his hand flow back into the lake down the gap.

"However, such tourism resources have not been developed... Qian Yu lowered his head and looked up, taking in the scenery around here. "It's so interesting...

"It's a little remote and not easy to develop, right?" Gray Plains looked around the area. "What's more, it's all woods, and if you want to develop it, you have to cut down a lot of trees, and I'm afraid this proposal will be difficult to pass."

"It's a pity." Thousand Feathers shrugged. At this moment, Chiba suddenly noticed that Ayumi seemed to have discovered something, and stared blankly at the back of a stone. "Ayumi seems to have discovered something? I'll take a look. ”

“。。。” Ayumi was looking at something in the middle of the crack in the stone, but suddenly the voice of a thousand feathers appeared behind her.

"What's wrong, Ayumi?"

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

"Do you see anything?" Chiba asked, casting her gaze as Ayumi looked.

A sealed, somewhat worn plastic bag was stuck between two large rocks.

"Who threw it here?" Chiba walked over to the plastic bag and observed. "No matter how you look at it, this bag should have been discarded here for a long time... Forget it, I'll take this bag with me later. ”

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

"Yes," Chiba said, picking up the plastic bag, only to find that something was wrong with the plastic bag. "Huh?"

This thing is not so much a black plastic bag as a black plastic sealed bag. Although it is now sealed and it is impossible to see what's inside, this heavy feeling and the clearly visible spherical falling object on the surface of the plastic bag clearly indicate that there is something unusual inside the plastic bag. Is this terrifying density a mechanical artifact? So heavy, copper? Lead products?

"Ayumi," Chiba turned back and showed the bag to Ayumi. "I feel like there's something in there. You step back a little and hide behind the rocks. ”

"Oh... Ayumi was stunned for a moment, but decided to obey and obediently hid behind a distant rock.

“。。。” Qian Yu took a deep breath and unpacked the plastic sealed bag, but nothing bad happened. Then, Chiba put the plastic bag on the ground and poured out the small ball in the bag.

It was a small round ball, slightly smaller than a normal checkers marble, with a dull earthy yellow sheen and an unknown stripe tattooed on it—although it was always felt that these stripes had some special association, but Chiba could not decipher them.

More subtlely, this bead is surprisingly heavy. As a gunsmith who has touched countless materials, Chiba is sure that the density of this bead is much greater than that of lead and copper, and even comparable to the density of gold.

Is this gold? Qianyu's surprise was even worse—even if it was an alloy made of some metal heavier than gold mixed with other metals, it was a very valuable thing. Generally speaking, materials that are denser than gold are more expensive than gold.

After Qian Yu cleared his mind, he rechecked the plastic bag and found that there was a booklet inside. After emptying half of the booklet from the bag, Chiba realized that it had once been a black booklet—because the cover of the booklet had worn out for some reason, almost completely faded.

This bag is certainly not garbage, but something very valuable... Qian Yu thought for a moment, put the ball back in the bag, and then resealed the bag and put it in his pocket.

"We're out of time!" In the distance, Conan shouted to this side. "It's time to go back!"

“。。。” Chiba glanced in Conan's direction, shrugged her shoulders, and motioned for Ayumi to come out from behind the stone where she was hiding and join Conan with herself.