"This is Grandpa Guanghua's home," the witch said, coming to the iron gate and taking out a large key from her arms. "Oh, I remember that the key to Grandpa Guanghua's house is-"

Qianyu and Conan looked at each other in surprise - does this miko actually have the key to someone else's house? It seems like there are many more.

"No need to be surprised," the witch said as if she had eyes behind her back, or as if she could guess the thoughts of the two of them. "Many of the followers of Goddess Chayiji are lonely old people, and it is my duty to help them in time. But sometimes

They have limited mobility or something happened and cannot open the door, so I need the house keys of every grandparent who has limited mobility." After the witch said, the iron door opened in response. "Come in with me."

"Grandpa Guanghua," the witch gently opened the door of the house. "It's me, Ying."

"Your Highness the Miko," an old voice came from a room. "You are here. Please forgive me for not being able to welcome you."

"Grandpa," Ying took off her shoes and walked into the room. Qianyu and Conan followed. "I'm here."

In the room, an old man was trying his best to sit up from the bed. Ying quickly assisted the old man. "Grandpa Guanghua, you don't have to get up in a hurry. What's wrong with your wheelchair?"

"Originally, as long as you press and hold the forward button, the wheelchair will automatically move forward." Grandpa Guanghua was about to point to the wheelchair, but something strange happened. "Um, Your Majesty, are those two children?"

Before the miko could answer, Qianyu had already made a judgment.

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

Qianyu's finger pointed at the gap between a shaft and a gear. "Look, there should have been a gear here."

"The transmission wheel is gone?" Conan immediately came over to check the situation. "What...what's going on?"

"The transmission wheel is gone?" Grandpa Guanghua was surprised when he heard this. "How is this possible? Has it been dismantled?"

"Grandpa, when was the last time you used a wheelchair?" Qianyu tried pressing the operating panel on the armrest of the wheelchair and found that the motor at the bottom of the wheelchair could still run and the transmission shaft could also rotate. However, because there was no transmission gear, the motor

The force cannot be transmitted to the wheels at all. "This gear should have been removed, otherwise it is impossible -" When Qianyu tried to put down the wheelchair and looked at the transmission part, he found that the ground where the wheelchair was before it was moved

There is a lot of dark gray powder on it. "This is it?"

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

"No matter what this powder is, let's collect it first." After receiving permission, Conan took a small plate from Grandpa Guanghua's coffee table and put the powder on the ground into the plate with a paper towel. "This may be from

It fell off the person who stole the gear."

"Don't worry about it for now, Grandpa, do you have spare consumables for the wheelchair?" Qianyu looked at the parts of the wheelchair and said distressedly. "If there are no consumables, unless we can find the person who took the gear, there is nothing I can do."

"This wheelchair has no spare parts because it was a wheelchair made by Ifukube twenty years ago for me who was paralyzed trying to save him." Guanghua said slowly.

"Ifukube?" Qianyu was suddenly activated by this surname. "You mean Ifukube? Master Ifukube Noku?"

"Is Nohisa actually called a master..." Guanghua was a little surprised, but then returned to normal. "Yes, at least I know her name is Ifukube Nohisa."

"This is the work of Master Ifukube..." Qianyu's expression instantly turned to worship as she looked at the wheelchair. "Oh my god...Grandpa, can you give me some time to try to dismantle this ingenious piece of work?"

Works? If there is any damage, I will compensate you for a pair of the best wheelchairs."

"Hmm -" Guanghua pondered for a moment, then said, "Tear it down."

Qianyu was a little surprised by Guanghua's agreement. "Ah...oh...ok."

"The look in your eyes is so familiar to me," Guanghua said slowly just as Qianyu was unscrewing the screw cap with his hands. "Eighty years ago, when I first met Nojiu, she had this look in her eyes.

Repairing a bicycle."

Qianyu did not answer, but carefully observed the mechanical structure of the wheelchair. The entire mechanical structure is much different from that of a normal wheelchair, but as long as you have a little knowledge of mechanics, you can see that this wheelchair has structural advantages over normal wheelchairs, including weight.

It is definitely not the five to ten kilograms of a normal wheelchair, but three or four kilograms.

"..." Conan looked at Qianha, who was already studying Ifukube's wheelchair almost to the point of madness, sighed, and turned back to look at the mysterious powders.

I didn't know it, but I was shocked when I saw it - the plate was actually damaged, with a hole exposed!

"This!!!" Conan couldn't hide his surprise. He stepped forward to check and saw that the powder had leaked from the hole in the plate onto the table, and the amount seemed to have increased.

"Crack!" The sound of metal hitting the ground reached Conan's ears, and Qianyu was seen staring blankly at a puddle of powder on the ground.

"Qianyu!" Conan instantly realized what had happened. "Quickly dismantle the transmission gear and other parts connected to this broken part!"

"What?" Qianyu was stunned.

"Hurry up and take it off! Otherwise it's over!" Conan's unquestionable expression made Qianyu do it immediately.

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

"Tin epidemic!" Conan said as he ran out of the room. A minute later, he brought a basin of water over and actually threw all the parts Qianyu had removed into the water!

"What are you doing!" Qianyu was shocked. "It will rust!"

"Didn't you hear me say 'tin epidemic'?" Conan threw the parts into the water and rinsed them before throwing them aside. "Some of these are tin parts, and these tin parts are infected with tin epidemic, so they are

It will transform from normal white tin to gray tin. Gray tin is powdered, so the transmission gear will disappear. I also saw that the plate was corroded by the powder, and the plate is silver-white, so I can think of silver-white.

of white tin.”

"Tin epidemic?" Qianyu disassembled the parts, threw them into the water one by one, washed them, and then took them out. "Does tin epidemic require sub-zero temperatures to appear?"

"Did you notice that there is a net bag for storing things under the wheelchair?" Conan was still washing the parts. "There is an ice cream bag in the garbage bag beside the table. Judging from the color of the inner material, it is made of thermal insulation material. It 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 would the merchant put in the takeaway ice cream?"

"Takeaway ice cream? Low temperature..." Qianyu muttered and suddenly thought of the answer. "You mean dry ice?"

"Yes," Conan shrugged. "The position of the bag opening should be right below the transmission gear. The cold air generated by sublimation caused the transmission gear to be frozen, causing the transmission gear to get tin disease."

"What should I do with Grandpa Guanghua's wheelchair?" Ying asked worriedly.

"Your Highness the Miko, can you help me order a new wheelchair?" Guanghua said calmly. "Because it can come and go, it can be regarded as a reincarnation."

...

When Ying, Conan and Qianyu left Guanghua's home, Qianyu finally couldn't bear it anymore.

"What did grandpa mean by what he said just now?" Qianyu asked curiously, looking at Conan who had a smile on his face that showed successful reasoning.

"On our way in, did you notice that there was a closed shrine in the corridor?" Conan replied with a smile. "There is a smell of vanilla and incense in it."

"What do you mean-" Qianyu seemed to have guessed the answer.

"Yes, there should be Ifukube Nohisa's spiritual tablet in there," Conan nodded. "That's the person he values ​​the most."

"Wait...wait a minute, you mean Ifukube Noku is dead!!!???" Qianyu suddenly extracted an extremely bad news from Conan's words.

"Yes, after all, if Ifukube Nohisa lived to this day, he would be eighty or ninety years old. It is normal for him to die."
Chapter completed!