"This is Grandpa Guanghua's house," said the shrine maiden, coming to the iron gate and taking out a large number of keys from her bosom. "Woo, I remember that the key to Grandpa Guanghua's house was-"

Chiba and Conan glanced at each other in surprise - does this shrine maiden actually have the key to someone else's house? It looks like there's a lot more.

"Don't be surprised," the shrine maiden seemed to have eyes behind her back, or as if she could guess the thoughts of the two. "Many of the followers of Goddess Chayiji are lonely old people, and it is my obligation to help them in a timely manner. But sometimes they can't open the door because they have mobility issues or something happens, so I need a key to every grandparent who has difficulty moving. After the shrine maiden finished speaking, the iron door opened. Come in with me. ”

"Grandpa Guanghua," the shrine maiden gently pulled the door of the house open. "It's me, Ying."

"Her Highness the Shrine Maiden," an old voice came from one room. "You're here, please forgive me for not being able to greet you."

"Grandpa," Ying changed her shoes and walked into the room, followed by Chiba and Conan. "I'm coming."

Inside the house, an old man was desperately sitting up from the bed, and Ying hurriedly assisted the old man. "Grandpa Guanghua, you don't have to rush to get up. What happened to your wheelchair? ”

"Originally, as long as you press and hold the forward button, the wheelchair can move forward automatically," Grandpa Guanghua was about to point to the wheelchair, but found something very strange. "Eh, Your Highness the Shrine Maiden, who are those two little children?"

Before the witch could answer, Chiha's side had already given her judgment.

"What's wrong with this... Qian Yu turned the wheelchair over and said speechlessly. "The transmission wheel is gone!"

Chiha's finger pointed to the gap between a shaft and a gear. "Look, there's supposed to be a cog here."

"The drive wheels are gone?" Conan immediately came over to check on the situation. "This... What's going on? ”

"The drive wheels are gone?" Grandpa Guanghua was surprised when he heard this. "How is this possible? Could it be that it was demolished? ”

"Grandpa, may I ask when was the last time you used a wheelchair," Qian Yu tried to press the operation disc on the armrest of the wheelchair, and found that the engine at the bottom of the wheelchair could still run, and the transmission shaft could also rotate, but because there was no transmission gear, the power of the engine could not be transmitted to the wheels at all. "This gear should have been removed, otherwise it can't be—" When Chiba tried to put down the wheelchair and looked at the transmission part, she found that there was a lot of dark gray powder on the ground where the wheelchair was before it was moved. "What is this?"

There shouldn't be powder on any part of the wheelchair!

"Whatever the powder is, let's talk about it after collecting it." After getting permission, Conan took a small saucer from Grandpa Guanghua's coffee table and put the powder on the ground into the dish with a paper towel. "Maybe it fell from the person who stole the gears."

"Leave that alone, grandpa, do you have spare supplies for wheelchairs here?" Qian Yu observed the parts of the wheelchair and said in distress. "If we don't have consumables, unless we can find someone to take the gears, I'm helpless."

"There are no spare parts for this wheelchair, because this is the wheelchair that the Ministry of Welfare made for me who was paralyzed in order to save him twenty years ago." Guanghua said slowly.

"Ifubu?" Chiba was suddenly activated by this surname. "You mean the Ifubu? Is Master Nokuhisa Ifukube? ”

"Can you be called a master for a long time? . . ." Guanghua was slightly stunned, but then returned to normal. "Yes, at least I know her name is Nokusa Ifukube."

"This is the work of Master Ifububu... Qian Yu's expression when he looked at the wheelchair instantly became worshipful. "OMG... Grandpa, can you give me some time to try to disassemble this ingenious work? If there is any damage, I will compensate you for the best wheelchair. ”

"Hmm-" Guanghua pondered for a moment, then said. "Let's tear it down."

Qian Yu was a little surprised by Guanghua's agreement. "Ahh Oh... Good. ”

"Your eyes are all too familiar to me," Guanghua said slowly as Qian Yu unscrewed the screw cap with his hand. "Eighty years ago, when I first met Noku, she was repairing a bicycle with such eyes."

Chiba didn't answer, but carefully observed the mechanical structure of the wheelchair. The structure of the whole machine is much worse than that of a normal wheelchair, but as long as you have a little mechanical knowledge, you can see that this wheelchair has the structural advantages over a normal wheelchair, and the weight is definitely not five to ten kilograms of a normal wheelchair, but three or four kilograms to the head.

“。。。” Conan looked at Chiba, who had already studied the wheelchair of the Ifubu to the point of madness, sighed, and turned back to look at the mysterious powder.

I don't know if I know, but I was shocked when I saw it - the plate was actually broken, revealing a hole!

"This !!" Conan couldn't hide his surprise and went up to check, only to see that the powder had leaked through the hole in the plate to the table, and the amount seemed to be increasing.

"Smack!" The sound of metal falling to the ground reached Conan's ears, and Chiba was staring blankly at the powder on the ground.

"Thousand feathers!" Conan instantly reacted to what was going on. "Quickly disassemble that transmission gear and the other parts that connected to this broken part!"

"What?" Qianyu was stunned.

"Hurry up and tear it down! Otherwise, it's over! Conan's unquestioning expression made Chiba do the same.

"I'm doing it, but please tell me why?" Chiba immediately disassembled the parts and asked at the same time.

"Tin plague!" Conan said as he ran out of the room, and a minute later, he brought a basin of water and threw all the parts that Qianyu had dismantled into the water!

"What the hell!" Thousand Feathers was shocked. "It's going to rust!"

"Didn't you hear me say 'tin plague'?" Conan threw the parts into the water and shook them before throwing them aside. "Some of these are tin pieces, which have been infected with tin plague, so they will change from normal white tin to gray tin. The gray tin is powdered, so the transmission gear disappears. I also saw that the dish was corroded by powder, and the dish was silvery-white, so I could think of silvery-white tin. ”

"Tin plague?" Qianyu disassembled the parts, threw them into the water one by one, washed them, and then took them out. "Tin plague needs sub-zero temperatures to appear, right?"

"Did you notice that there's a net pocket under the wheelchair?" Conan was still washing the parts. "There is an ice cream bag in the garbage bag next to the table, judging from the color of the internal material, it is an insulated material, which is obviously a takeaway ice cream, so we can conclude that Grandpa Guanghua once put the bag in the net pocket under the wheelchair, and what will be put in the merchant's takeaway ice cream?"

"Takeaway ice cream? Microtherm... Qian Yu muttered, and suddenly thought of the answer. You mean dry ice? ”

"That's right," Conan shrugged. "The position of the mouth of the bag should be directly below the conveyor gear, and the cold air generated by the sublimation caused the conveyor gear to be frozen, causing the conveyor gear to get tin plague."

"What about Grandpa Guanghua's wheelchair?" Ying said distressedly.

"Your Highness, can you order a new wheelchair for me?" Guanghua said calmly. "Because it can come for a long time, because it can go for a long time, this wheelchair can be regarded as a reincarnation."

。。。

When Ying, Conan, and Chiba left Guanghua's home, Chiba finally couldn't help it.

"What did you mean by that old man?" Qian Yu looked at Conan, who had been smiling with a successful reasoning smile on the corner of his mouth, and asked curiously.

"Did you notice a closed shrine in the hallway on our way in?" Conan replied with a smile. "There's a smell of vanilla and incense."

"What do you mean—" Chiba seemed to guess the answer.

"Yes, it should be the spirit seat of Ifubu Noku," Conan nodded. "That's the person he values the most."

"Wait... Wait a minute, you're saying Ifukube is dead!!??? Chiba suddenly distilled a terrible piece of bad news from Conan's words.

"Yes, after all, if Ifubu can live for a long time, he should be eighty or ninety years old, and it is normal for him to die."

"Ahh Chiba covered her face, and her depressed mood was revealed in her voice.