In the afternoon, Qian Yu was making spare arrows for the Traceless Umbrella, when she suddenly heard the sound of a telephone.

"A thousand feathers?" Kaede Hoshino's voice came, sounding very weak. "Open the back door of your house... Back door... With that, he hung up.

“？” Qian Yu was in a daze, but saw a light on the board next to the workbench come on.

This light is connected to an infrared sensor system at the back door - could it be that Hoshino Kaede means he is at the back door?

Qian Yu hurriedly came to the back door, looked at the iron gate in the backyard from the optical cat's eye on the door, and saw Hoshino Kaede kneeling against the iron door.

Why is he here? The front door is not locked, so why doesn't he go to the front door?

"Hoshino?" Qian Yu hurriedly opened the back door and rushed over. "What's wrong with you?"

Kaede Hoshino did not respond to him.

Chiba touched Hoshino Kaede's nose and confirmed that he was still breathing, and immediately opened the iron door and dragged Hoshino Kaede into the house.

Chiba had never seen Kaede Hoshino in such a state - in fact, the change of the term to "human" was completely valid - so he chose to ask for help.

"Do you have a blood pressure monitor at home?" Grigory said with his legs on the table, half-reclining in an armchair. "Measure it."

A minute later, Qian Yu measured a 60/40 indication - 70 is systolic blood pressure and 40 is diastolic blood pressure, both values are well below normal, and even far below normal low blood pressure.

"Does your friend have a history of hypotension before?" Grigory snorted and continued. "Are there any diseases related to blood vessels? What is the onset status? ”

"As far as I know, the onset of the disease is unknown, but it should be a sudden discomfort while walking."

"The norepinephrine (now known as norepinephrine) in the luxury home medical kit you bought earlier from Rice Flower Central Hospital. Didn't run out of it, did you? ”

"It's not consumed."

"Do you remember the injection technique I taught you?"

"Uhhh A thousand feathers are embarrassed. "Remember...

Some time ago, when Chiba went to review the gunshot wound he had suffered in the case of Takeda Shingen's treasure, Gregory, who was understaffed by the nurses, went to work and learned painless injections by the way—at the cost of a few needles and a dessert on a nurse who made a mistake.

"Give him a shot of positive adrenaline, remember to dilute it to 10 milliliters with saline," Grigory's voice relaxed. "It's just low blood pressure, and it's most likely caused by too much antidepressant use."

"Antidepressants?" Qian Yu confirmed with a frown as he went to get the home medical kit. "You mean he takes antidepressants?"

"It could also be a sedative or a blood pressure medication," Gregory said. "But sedatives are not accessible to the general population, and antihypertensive drugs are not taken by people who do not have a blood vessel-related disease — heart disease. Considering that the Japanese economy is so sluggish right now, aren't antidepressants a very reasonable explanation? ”

"Uh... That,I'll confirm... Qian Yu came to Gregory's side with the medicine box, and looked at the adrenaline medicine bottle in the medicine box and was suddenly stunned. Is it adrenaline or norepinephrine? ”

"Norepinephrine!" Gregory's voice suddenly became stern. "Playing adrenaline strengthens the action of β receptors, causing lower blood pressure, and that will kill him!"

"Understood," Qianyu turned on the hands-free mode, took out a pair of plastic gloves, and then took out a norepinephrine tube and a saline tube. "The pharmacology of epinephrine is to activate both α and β receptors, but due to the drug-induced blockade of α receptors, adrenaline primarily activates β receptors – which causes vasodilation and further lowers blood pressure. Therefore, norepinephrine, which primarily activates α receptors and blocks β receptors, must be used to stimulate α receptors alone. ”

A usable norepinephrine injection tool is installed by inserting norepinephrine and saline into a disposable syringe with a blunt needle at the end of the propelling plug and a new disposable needle set on the syringe.

"Sounds ready," Grigory's voice came from the phone. "Do you remember why the syringe thruster is so long?"

"In order to puncture the plastic cylinder and facilitate the mixing of the drugs inside," said Qianyu, pushing the syringe down, and the blunt needle immediately pierced the saline cylinder and the norepinephrine cylinder, and the two liquids immediately mixed. "The vein is thrust at a low speed, at an angle of 30 degrees, and the needle is two-thirds of the way through – oh!"

Qian Yu suddenly picked up the alcohol bottle in the medicine box and sprayed it a few times on the back of Hoshino Kaede's hand. "I almost forgot to sanitize...

After eliminating the poison, Chiba grabbed Hoshino Kaede's hand and found the vein on the back of his hand without much effort. "Found it...

The needle pierced the vein precisely in the alcohol-covered area, and slowly injected the drug into Kaede Hoshino's vein - although it was slow, it had already exceeded the speed of the most commonly used intravenous drip of norepinephrine, and the direct injection was just to ensure that Kaede Hoshino was not worried.

"Alright, this needle should last until the ambulance arrives," Grigory's voice began leisurely again. "Open the door so that it is easier for the medical staff to move people directly into the car when they come."

With that, the phone hung up.

When Chiba opened the door along with the iron door and walked back, he found that Kaede Hoshino had opened his eyes.

"Looks like I'm still alive... Hoshino Kaede said weakly.

"You're still alive mainly because I still have norepinephrine to fight here," Qian Yu frowned. "You'll be safe when the ambulance comes."

"Thanks to you for saving my life... Hoshino Kaede smiled bitterly.

"By the way, are you taking antidepressants?" Qian Yu suddenly remembered what Gregory had said before and asked.

"Nope!" Hoshino Kaede was stunned.

"Your blood pressure is 60/40," Chiba showed Kaede Hoshino the results from the previous sphygmomano. "This is obviously not normal."

"I was put together by the prey before... Hoshino Kaede shook his head helplessly. "Careless, the tea that guy handed me is probably a large dose of sedative, and I felt something was wrong on the way home, and I tried my best to get to you...

"The tea handed to you?" Thousand Feathers raised an eyebrow. "Your relationship is so good that you're going to hunt him down? You're not going to be on the task of the Inspectorate, are you? ”

"No," Kaede Hoshino shook his head. "I had some trouble when I was helping Gray Yuan Wai deal with the identity problem, and the guy who was originally with me didn't interfere with the river water in the well put me together."

Just then, the phone rang again - the caller was Gray Plains.

As soon as the phone was connected, Gray Yuan's anxious voice came.

"Chiha, Mr. Hara has been killed!"

In the distance, the sound of an ambulance sounded.