It's a summer night, but sometimes it seems to be unexpectedly cold, and this feeling even makes Mitsuki Umihara flash the idea of turning off the air conditioner.

Of course, this is just a boring thought. He also knows that the outside temperature can be very high during this season. With the exception of some environmentalists, no one would choose to give up the right to air conditioning during this season – and while this was a reason to do so, the development of superfluids and superconducting technologies in Lyceum makes the idea of saving electricity meaningless.

But Mitsuki Umihara didn't plan to turn on the lights. He went straight downstairs from his room, through the hallway paved with light and dark checkerboards, which was famous among the students of housekeeping, to the rear.

The passage led to the back of his family's imposing house, where there was a study.

In fact, this study can be called a small building in its own right. Because it is much larger than the concept of an ordinary study. And apart from this fully enclosed aisle, it has almost no connection to the main body of the house. And because of the architectural composition, if you are outside the house, this study will be obscured by the rest of the house from any angle.

Unless someone can stand in the sky and look down.

In this way, this study seems rather mysterious. In this era, with the exception of a few institutions (such as Tokiwadai), few people still have the habit of collecting such a large number of physical books. As far as Mitsuki Kaihara knows, there are indeed many chaotic home economics students who come here to work here to discuss this as a mysterious topic.

Mitsuki Kaihara pushed open the door and stepped into the study. At first glance, pure white books and pure black tall bookshelves fill the entire horizon, and this complete black and white color does have a sense of historical mystery.

But in fact, many things are not as romantic and mysterious as imagined, and sometimes even a little ridiculous. At least Mitsuki Haihara knows very well that this study was just designed by someone three years ago. (Note)

Mitsuki Umihara poured a glass of water at the water dispenser at the door of his study, where he planned to complete his summer project. It wasn't something that could be done in a day, but there was plenty of time, so he wasn't in a hurry.

Passing through the third row of tall wall-like bookshelves, there are five Platonic cubes by the window. Two of them were used as temporary storage spaces, while the other three were designed as small desks.

His father was sitting there writing something.

He was about to step forward when a pair of small, delicate feet swayed and floated down from the air so tall that they could not be reached without the use of a long ladder.

This really scared him. He instinctively stretched out his hands to support his delicate little feet, but he also caused the cup in his hand to fall to the ground and shatter.

"Yikes!"

Along with the sound of the cup breaking, there was a cute scream of a girl.

Although the process is a little inexplicable, we can imagine what kind of reaction a girl will have when she is suddenly grabbed by her feet. But it is unlikely that in such a state where it is basically impossible to maintain balance, although the girl twisted her body a few times, she did not fall from the palm of Mitsuki Haihara.

As a result, this scene became a girl standing in the palm of Mitsuki Haihara's hand, covering her small mouth at a loss.

Although "holding a girl in the palm of your hand" is a common phrase used to describe pampering, now Mitsuki Umihara is really "holding a girl in the palm of your hand".

The girl's soft and boneless feet have a charming charm, and even make Haihara Mitsuki a little distracted for a moment. However, he immediately reacted that there was obviously only one person in this family who could do such a thing.

"What are you doing here?"

He asked, looking up.

"No, actually, ......"

The sister standing in the palm of his hand was obviously half a beat slow to react to such a situation, and even when she reacted, the first action she made was not to jump off his palm, but to press the hem of her skirt with her hands holding the book.

This is already a bit of a complete mess.

Haiyuan Mitsuki didn't care at all in his heart, although it was the weight of a girl, but his sister's ability obviously made her body very light. Besides, even if his sister doesn't use her abilities, it's easy for him to hold up a girl's body.

"I asked her to help me find a book."

At this time, the father of the two looked up from his head and said.

"Father, I'm sorry to disturb you."

Hearing her father's voice, the younger sister who was standing in the palm of Mitsuki Umihara's hand immediately turned around - she seemed to have completely forgotten about coming down first.

Looking at the knee of his sister who was close in front of him, Mitsuki Kaihara felt a little funny. Without waiting for his sister to react, he just kept this posture and walked forward like a mischief. This move naturally frightened her sister, but she didn't know what to do.

It wasn't until the two of them came to the chair where their father was sitting that Mitsuki Umihara slightly threw his sister forward in the palm of his hand. This seems to be a dangerous move, but he knows too much about his sister's abilities, but he knows that it will not cause any danger to his sister.

Sure enough, my sister jumped lightly and skillfully, and stood firm on the ground gracefully and easily. Her movements. It's so light that it's like a fairy dancing, which is pleasing to the eye.

Watching this interesting and heartwarming interaction between the siblings, their father was heartily grateful.

"Did you find it?"

"Yes, Father. Yes, there is. ”

The younger sister handed over the book she was holding. Taking advantage of this gap, Mitsuki Umihara glanced at the title of the book. All the books in this room are the product of a technical demonstration, so they are not the usual editions on the market. All of the books have plain white covers and large black font titles, so they are exceptionally legible.

"Lancaster Law's Surprising Discovery of Witches"

It's weird.

"Father, is this going to write a thesis?"

Mitsuki Umihara cautiously leaned into his sister's ear and asked.

Their father was a physics student, but later he made some achievements in history, which both siblings know. In fact, their father did sometimes write some historical papers, among which the history of science and religion were more common.

But the younger sister shook her head, and also leaned into Haiyuan Mitsugui's ear and said:

"No, my father said he was going to write a letter."

"Write a letter?"

It's an even weirder thing. In this era, there are still people who write letters?

Obviously, even a smart person like my sister can't give an answer to this question.

"I just want to be as formal as possible. After all, even if it is the same content, different ways of conveying it will lead to different levels of attention. From this point of view, the information contained in the two is already different. ”

Father turned the page and said.

Both siblings were able to understand their father's words. In fact, this property of information holds a place even in physics.

"Who is that for?"

Mitsuki Umihara asked. He noticed that his father was taking some excerpts from the open book.

"A good old man who is old but still doesn't understand that true evil can only come from good intentions. I think she needs some advice, otherwise she may go further and further down the path of her ideals. I have to admit that it probably doesn't make much sense. After all, good people may have high prestige, but they are usually not taken seriously. Even some of the old stubborn opinions are more noticed, because at least their foul temper is impressive. ”

"Haaa......"

Mitsuki Umihara heard his sister's voice of incomprehension, and to be honest, he found it difficult to understand, although the meaning of his father's words was very straightforward.

"There's never anything to be done back in this world, because things tend to get worse and worse. Including what I said about the thoughts of this good old man who is worthy of respect but cannot be counted on. Some people will miss the past when they get older, and naturally some people want to see hope in their children after seeing too much of the ugliness of adults, although in my opinion it is just selective amnesia. The father gestured to the brother and sister. Don't stand there, come and sit. ”

"Ah, I'm going to clean up the debris."

Mitsuki Umihara turned around and went back to where he had broken the cup earlier. The water had been drained away by the tiny conduits hidden in the nanofiber floor, and only the debris was still there.

Bringing a tray from the water dispenser, Mitsuki Umihara bent down to carefully clean up the pieces.

Father's words always tend to get worse and worse, and probably nothing could be more intuitive than that.

Everyone has seen a cup fall to the ground and shatter, but who has ever seen a broken cup come back to its original state on its own?

In fact, it's an equivalent process. At least in the laws of physics, both are allowed, and there is no stipulation that only the former can occur.

But I'm afraid no one has ever seen the latter. While the laws of physics do not prevent the latter, there is one law that dictates that the probability of the latter occurring is so small that it is almost non-existent.

It is perhaps the saddest, most desperate, but also the fairest law in the world.

Whether we have life or not, whether we are as great as the universe or as small as gravel, we cannot escape its domination.

It once had many names, from the old woman who defeated Thor in Norse mythology to the Moros who rendered Zeus powerless in Greek mythology. But nowadays, we generally refer to it as "entropy".

It is just a bland narrative of a trend, but this trend determines the ultimate fate of everything.

It says, "All things must die." All things are guided to death by it.

This process of decline is inevitable. From a pessimistic standpoint, all human efforts are nothing more than a futile struggle in this inevitable outcome.

This is the content of the subject chosen by Mitsuki Haihara - to access this process from disorder to order, to create a certain order in this desperate process.

Everything from machinery, to architecture, to life, is nurtured in this way.

It is a desperate struggle, but humanity has made this struggle so brilliant and gorgeous, and this is the only reason why humanity is great.

From this point of view, the reason why telekinesis is the most common and universal ability may not be complicated at all. Because it is the embodiment of this greatness in itself, it is the most understandable personal reality of human beings.

He wanted more, a deeper understanding of this great power. This desire is especially strong after learning that my sister has become LV.5......

_

Suddenly, Mitsuki Umihara was stunned.

He was never a fuss man, but when he came back to his senses from thinking about the subject, he was stunned by what was close to him.

It wasn't something incredible, just an ordinary teacup.

A teacup in perfect condition.

A teacup that had been broken by him, but was now sitting intact on the tray.

It's not a delusion.

He noticed a red halo, which was the triangular prism on his chest that was glowing.

"Father, what's that?"

He heard his sister's confused voice behind him. Turning around, he saw a white glow in the dark sky piercing the clouds.

The light seemed to echo the triangular prism, emitting a pulsating light.

Of course, he will not forget who gave this triangular prism to himself.

(Could it be...... ）

He quietly tucked the triangular prism into his garment and put the teacup back in its place.

It's like nothing happened.

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Note: This study was originally a storage room, and everything in this study was created by Tokiwadai to show off a certain technology.

It's kind of ridiculous. It was a public display of technology in the garden of the school house, and Tokiwadai showed off a technology that was a cheap nanofiber.

Sometimes it's overdone when you're doing it, and that's what you're saying.

For some reason, the pure technical demonstration turned into a more serious record for the length of a single bundle of fibers. In the end, Tokiwadai's partner companies were able to produce an ultra-long fiber that surpassed everyone's imagination. So when it was done, everyone was puzzled - what exactly is going to be done with such a long fiber?

After discussion, Umihara, who is the chairman of Tokiwadai, bought the fiber. At that time, the contents of the exhibition included not only materials, but also commissioned a large number of famous books to be copied using the same fiber weaving technology that was also exhibited to the outside world. Even the text is woven using the same mixture of dyed fibers.

That's where this study comes from. This study is full of books, including bookshelves, floors, walls, all of which are the product of that single fiber. It is said that two-thirds of the fiber is still stored in Tokiwadai.

This truth is not at all mysterious, but even somewhat ridiculous.

However, Umihara Dome really likes this study. A lot of the time, she likes to come here and enjoy reading – even though it's a time when physical books are becoming obsolete.

These books are all-encompassing, including even old books like the Codex Sinaiticus. However, since it was not a commercial publication as a technical display, the title of the book was marked with a thick white cover (also woven from that fiber) and in a standard large black font. Other than that, there is no embellishment.