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Ruby couldn't figure out why Amon wanted to beat Meiya until the end, but it didn't seem like he wanted to fight to the death and let them go. He returned to the laboratory to continue developing the plague vaccine while he was full of energy.

Time passed by, and Ruby spent another day and night in the laboratory. The development of the vaccine was not smooth, and he never found a drug that could effectively swallow the virus.

When Kisaragi opened the door and entered Ruby's room, she saw Ruby who was already asleep on the table. There was a faint fragrance in the air. It was a cup of coffee on the table, which seemed to be used to refresh himself, but He collapsed from exhaustion before taking a sip.

Kisaragi's mood is very complicated, and she also wants to help Luby share a little pressure, but she can't be as smart as Meiya, and she can't do everything to protect him like Amon, all she can do now is just can't bear it Let Ruby lie on the table to sleep, move him to the bed to let him have a good rest, but accidentally knocked over the cup of coffee when picking him up, the black liquid flowed around the table, and woke up and fell asleep Ruby.

"Miss Kisaragi, I personally don't like being hugged by a princess."

Ruby found himself lying in Ruyue's arms and complained silently, the girl with a sword practiced sword all the year round, so it was easy to pick him up, but her posture was unacceptable.

"I just want to take you to bed."

Kisaragi smiled mischievously, gently put Lubi down to let him stand still, and could only regret that she was clumsy, that she couldn't even do such a small thing well.

“this coffee”

Ruby wanted to clean up the coffee on the table, but stopped in the middle of speaking, seeing his frowning, Kisaragi thought he was angry, so she could only bite her lips tightly and said nothing.

Who knew that Ruby was not angry, but just picked up a piece of glass on the table and rushed out of the room quickly, Ruyue followed after him for no apparent reason, and when he came to the laboratory, he found that Ruby was staring at that thing called a microscope. Watching.

"What's wrong?"

Seeing Ruby's body trembling with excitement, Kisaragi asked strangely, is that cup of coffee so unique?Ruby trembled with anger.

"There is a play, like the moon, there is a play for vaccines!"

Ruby moved his eyes away from the microscope and pointed at the piece of glass excitedly. He originally planned to take the virus back to the room for research before taking it out. Unexpectedly, the virus that was sprinkled with coffee began to change significantly. He wasn't sure at first, until he put it under a microscope and saw that the viruses had lost their activity, so he was sure that it was the effect of coffee.

"Huh? What?"

Kisaragi looked at Lubi stupidly, but still couldn't understand what he meant.

"Coffee, it's caffeine! Caffeine is a drug that can swallow viruses, thanks to you spilling the coffee, Kisaragi, you are really a lucky star."

Ruby hugged Kisaragi excitedly, with his arms only around the girl's slender waist. He was so happy. The successful development of the vaccine also meant that the hundred thousand dark elves would be saved, and they would also be cleared of the suspicion of spreading the plague. It was caused by Kisaragi's unintentional mistake, after all, even he would never think of using coffee to kill viruses.

"Yes, is that so?"

Ru Yue couldn't help but blush when she was hugged, but she was happy again when she heard Ruby's sincere praise, as if she accidentally became the person who contributed the most here.

'click'

At this moment, the bright laboratory suddenly went dark, and someone turned off the light switch. The darkened environment also made Luby calm down a little.

"Sorry, I was so excited."

Ruby realized that he was still hugging Kisaragi's waist, and after a while of silence, he let go slowly, and Ruyue was able to come out of his embrace, and there was no longer that oppressive feeling on his chest, the quiet and dark environment Only the breathing of two people can be heard, and it seems that as long as one of them is willing to do something further.

"It doesn't matter, as long as it succeeds."

Kisaragi glanced at the side of the switch. Her eyesight is different from that of human beings. She can see clearly even in the dark. She saw the sneaky magic sword. Slipped out under the crack of the door.

Kisaragi opened the door without saying a word and chased after her. Not long after, she heard the scream of Mrs. Demon World, mixed with something like 'I'm helping you!Don't you feel ashamed when you turn off the lights? ' and the like.

After Kisaragi left, Ruby began to carefully study the effect of coffee on viruses. Of course, the coffee in his hand is not a product of another world. There are plants like coffee trees in the Holy Continent, but people from other worlds do not know how to roast and grind coffee. Of course, this kind of drink can’t be made. Ruby’s first coffee tree seed was exploded from the monster-shaped grass. There are still coffee trees cultivated by him in the back mountain of Dries, but they don’t grow many. Just make yourself a drink.

The maker of the plague virus had exhausted all his tricks and ripped all the hair off his body to develop this basically unsolvable virus, but he never expected that it would be cracked by a completely inconspicuous plant in the Sacred Continent. Bizet discovered that the dark elves secrete an enzyme that humans do not have, and this enzyme can combine well with caffeine to form an antibody that specifically restrains the virus. This is the so-called one thing down one thing.

As for the side effects, presumably after waking up you will become fond of coffee?

"What did you say, the vaccine has been successfully developed?"

Meiya excitedly stood up from her throne. She hid since Amon found out she kissed Ruby secretly, and planned to apologize after Amon calmed down. She still couldn't believe Ruby's words. She has also learned about disasters like the plague from history books. When does it appear without corpses?Even if there is a vaccine, it will only appear after countless people have died, and Ruby has developed a vaccine in just one week, which is simply not something that humans can do.

"Well, it's a coincidence, but there is one problem, the amount of vaccine is not enough, I need you to help me grow this plant in large quantities."

Ruby spread out his palm, and there was a coffee tree seed lying in it. Even he couldn't help but rejoice that he subconsciously asked Dragon to keep the coffee tree seed, otherwise his reserve of coffee beans wouldn't be enough for healing. many people.

"No problem at all. With the gradual awakening of the ancient war tree, our breeding ground can also be used. I will go now."

Meiya took the seed carefully, as if she had found a treasure, for fear that it would break, and after applying a few protection spells to it, she took Ruby's hand and took him to a certain level of the Ancient War Tree .

(End of this chapter)