Science for a Better Isekai
Chapter 4

The Fate Connected by the Small Wooden Cabin

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"What are you doing?"

Ruben felt his body suddenly become several times heavier, causing him to fall straight toward the ground. However, Mayuna had been prepared. "Cloud Magic: [White Cushion]." A soft cloud appeared abruptly on the floor, catching Ruben's body and preventing him from getting hurt.

"This isn't scientific! How can a cloud be soft?"

After falling onto the cloud, Ruben was shocked and spoke in disbelief.

"That's not the point, you idiot!"

Mayuna almost fell over. Instead of questioning her or being surprised by the magic, he was focused on the cloud.

"I wanted to ask this earlier: why do you have no magic power? Everyone in this world has magic power. And these suspicious tools of yours completely overturn my understanding of this world. Just who are you?"

Mayuna sat on the sofa and looked down at Ruben, who was lying on the cloud. She wasn't just some simple girl; her teacher was known as Yura the Petty Thief, a woman who had spent her life running rampant and doing all sorts of bad deeds. What? You have a precious magic book? It belongs to me now. What? His family has a pile of magic crystals? They are already in my space ring.

In short, before becoming a Magic Saint, she was chased and beaten every day, never having a moment of peace. As for later, once she became a Magic Saint, no one could beat her anymore (laughs).

"It's simple. I'm not from this world. These are all crystallization of my science. I am a scientist."

Ruben didn't get angry at Mayuna for returning his kindness with hostility; he honestly revealed his secret, though it wasn't really much of a secret.

"Hmm, then tell me, why were you able to cure my illness? Even the Pope couldn't cure it."

Being from another world wasn't enough of a reason for Mayuna to be surprised. This world wasn't isolated; legend had it that the great God of Light lived in the Heavenly Realm, and the angels of the Church occasionally appeared here.

"Nonsense. You primitive people only know how to use magic to treat illnesses. What is healing magic? It just accelerates cell activation to speed up recovery. It's fine for external wounds, but what about viruses inside the body? They are just waiting for you to provide them with nutrients to accelerate their reproduction. The more you use this crappy magic, the faster you die."

"...Oh."

Mayuna responded. She didn't really understand the scientist's explanation, but she gathered that he came from another world.

"We are strangers. Why did you save me? Weren't you afraid I was a bad person?"

Mayuna continued to ask. This was what she found most puzzling. She hadn't been obedient to Ruben and let him feed her medicine because she was naive, but because she knew she was dying and it didn't matter what happened. She hadn't expected to actually be cured. Since she was cured, she wanted to ask why people trusted each other so much.

"I will never watch someone die in front of me! As long as I have the ability, I will definitely save them. I don't care what kind of person you are until I've saved you."

"You guessed wrong. I am a bad person, and now I'm going to steal these things of yours and sell them for a good price."

Mayuna didn't know why Ruben had become so serious. Perhaps that was just the kind of idiot he was. She couldn't help but want to scare him to let him know the cruelty of the world.

"If the items are gone, I can make more. Can the tears you shed go back? If you are a bad person, why were you crying so sadly in front of this wooden cabin?"

"You saw that..."

Mayuna didn't know what expression to show Ruben. She waved her hand, stopping the supply of magic power, and the magic she had been using dissipated.

"You just said you came from another world? The Demon Realm, or the Heavenly Realm?"

Adjusting her emotions, Mayuna continued to ask. People from other worlds were not uncommon here, especially those from the Demon Realm; you could see them in any larger city.

"Neither. I come from Earth. Its development was completely different. There is no magic there, only science."

Ruben was finally able to move freely. He sat down next to Mayuna without hesitation, and the girl shifted to the side a bit unnaturally.

"Is it these strange tools? I really want to go see it."

Mayuna picked up the alarm clock on the table. The second hand cycling continuously made her very interested. If all it took to go to Earth was a 'door', she could open one herself.

"It's not the kind of place you can just open a door to like the Demon Realm. Besides... it has already been destroyed."

"Destroyed? Why?"

"Nuclear war. In terms you can understand, it's like countless mages casting forbidden spells together, destroying the entire planet's ecology. The land cannot grow plants, humans and animals cannot be born, and all fresh water is polluted. It is already a hell."

"Wait, then how did you get here?"

Mayuna imagined that kind of battle; it would indeed leave irreparable scars on the earth. But the point now was how Ruben got here. A world called Earth shouldn't be accessible by opening a door, or it would have been known by now.

"I was sent here by a man, as the last survivor of that world."

"Eh, how old are you now?"

Mayuna wisely didn't ask who that person was. She wasn't the type to pry, and she didn't think Ruben would tell these things to someone he had just met.

"By this world's calculations, about twenty."

"About?"

"Yeah. When I was sent here, my body turned into that of a five-year-old child. Although it adjusted my body functions to the healthiest period, he just left without caring whether I lived or died..."

A trace of resentment appeared on Ruben's face. That person was truly irresponsible. If he wasn't going to provide wealth, he could at least provide a meal. He was as willful as if he had simply changed a graveyard for himself.

"Just like me... how did you survive?"

"This Mountain has a lot of things. For example, gathering firewood. Although mages can start their own fires, restaurants and such sometimes need extra hands, so it was needed to some extent. There are also fruits on the trees that can be sold. I relied on this Mountain to get through the hardest times."

"So that's how it works. I really am like an idiot."

From the timeline, Ruben must have arrived in this world shortly after she was taken away by her teacher. Although Ruben couldn't be called a child when he arrived, he had figured out how to survive with a child's body. Compared to her, who did nothing but cry in the corner, he was far better off.

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