Midori, who was walking down the corridor of the Snow Oka Institute, ran into Junko, who had returned home, lurking his eyebrows.

"Wow, pure sister, you smell like blood."

"I haven't been shot in the head. I'm glad I learned from you, Tired, and made a second brain for the backup. The second brain isn't as amazing as Shizuno's magician."

Pointed out by Midori, Junko shows his usual unyielding grin.

"You're turning it into another brain for a bit. Because it's severely damaged and it's faster to replace it than to cure it."

"I can take it back... don't you play it?

Suspicious, Midori follows Junko. It's not just the current dialogue. There were signs that Junko's mental state was different than usual.

'So I'll tell you! Over 100 metres long, the Great Monster definitely has a system in place for your body that doesn't have to be crushed by its own weight!

'Ridiculous. It would be pointless at a time when that system only exists hypothetically - but!

'You say that? It's something without the Great Monster itself in the first place, and even though we're talking about it, it's preposterous to forbid us to talk about hypotheses'

"Then Arlaune, who became a great monster ten years ago... oh, Mr. Yukioka"

Junko and Midori came in a room lined with glass cylinders with brain and spinal cord. Inside, as always, discarded and immortalized scientists are lively discussing.

"Professors - I'd like to change my brain for a moment, so would you operate on my behalf?

"I don't mind, is something wrong?

Surprisingly, it was the brain of a Mad Scientist named Shigemitsu Fukuda, a newcomer here. He alone has no experience in the professorship, and because of the other three professors' too strong self, he became quite round in character compared to when he had flesh.

"Then I should ask Fukuda. I didn't get sniped. I thought we should change it to a spare here rather than regenerate or repair it."

"Fukuda, I didn't know you were going to take on the big business of exchanging your brains! Flattery! '

Let me know what you think later. Look, this is a duty. '

What values, the words of the brains are strange and Midori laughs small.

Junko then slept on the sleeping table that was in the room and the surgery proceeded tightly. The head is severed by the arm of the machine that extends from the ceiling to open the skull, and the brain inside is removed from each spinal cord. In the meantime, it was easy for Midori to see that he had been put into a state of temporary death by some supernormal force.

A cylinder with a brain and spinal cord emerges from the floor in the corner of the room. An arm of another machine stretching out of the corner of the room opened its lid, grabbed the brain intact and pushed it into the head of the pure child.

"Ugh... That's a good surgery..."

Midori spilled a bitter laugh because it was a huge mess of work that really just replaced her brain if she thought she would do more elaborate work. I also wonder if it won't contain weird fungi.

"Yukioka himself performs blood vessels and nerve joints. If you're someone else, you can't have proper surgery so far. Nevertheless, Yukioka, your ability to regenerate is scarce, so how about an immediate recovery?"

One of the professors, just the brain, answered. From Midori's point of view, it was a strange place.

At the point where the severed head was returned by the arm of the machine, Junko opened her eyes and sutured herself through the cutting area with her fingers.

How are you feeling?

"Not very good...... I guess. I'll be at rest for a while."

Junko suppresses his forehead with a rare and magical face.

"Normal, you have a powerful ability to self-regenerate. Although there are personal differences. Why doesn't Jun have it?"

Anticipating Junko's resuscitation, I'll bump into the doubts Midori has had since earlier.

"That's not boring with less risk of death. Well, it's not that I don't have the ability to play, it's just that I'm weaker than the rest of my overlife, and as you can see, to the extent that I blew my head off, I'm not dying, but come on. This body has so many abilities that it can't even get around to enhancing the playback function."

"I see. Sounds like a real sister. Ababa."

Midori shows her teeth, gives her an unusual laugh and laughs.

"That's right, and the Guardian Spirit guy Midori introduced me to, he knows who sniped me. Midori, did you choose to replace the Guardian Spirit in anticipation of this happening?

Midori's grin quickly disappeared on Junko's question.

The day after he came to this institute, Midori urged Junko that it was time to change the guardian spirit. It is not done intentionally, such as the replacement of the guardian spirit, and it is unclear what the prospects are and what Midori recommended such a thing, but Junko dared not ask about the intent because Midori said he could choose the technique of intentionally changing the guardian spirit and to some extent.

"No way... what a coincidence. He didn't feel any sign when he sniped?

"Yeah, there wasn't."

"Oh my... I knew it was him ~. I wonder if this was an inevitability due to the guidance of fate"

Midori's voice and expression irritate me slightly.

"Mmm, that's a pain in the ass. It's like a robotic weapon that appeared in the middle of this century. I can't believe you could kill without intent. It's more troublesome than bad overlife."

Junko's words were not exaggerated, and Midori agreed. If you can't react to the intent to kill, if you are struck unintentionally, that will be it. No, many of the combatants rely heavily on signs of attacks and reactions to killings. Even if you can suppress killing to the critical limit, you must always push the will to kill switch in your head, which is the last push.

It is impossible unless it is a program that has no heart, such as killing someone without it, and neither Junko nor Midori have ever seen anyone who could have executed it before.

To put it further, even if it's an attack from a mindless program, it's an incredible story to have each crisis aversion capability, such as crisis detection via the guardian spirit of Sixth Sense, so it doesn't even work.

"Speaking of which, Midori seems pretty close to the mystery of the soul's system, huh?

Junko asked Midori as she walked out of the professors' room just for the brain.

"Woah? Why are you talking like that all of a sudden?

"Tired, you told me. Okay? He said he was repeating his reincarnation without aging, retaining the power and memory of his previous life. Normally, if you reincarnate, most of your memory will be reset, and I've never heard of a way to keep it. Come on. I mean, it's a work of art that you can't do without some unraveling of how the soul works."

Junko's eyes were filled with a radiance of curiosity. He wants to listen fairly seriously, not at the level of public discourse, although in the same way as usual.

"The post-mortem world and the reincarnation system were riddled with mysteries and there was supposedly no way to know from here. Midori's pretty stepped in there, isn't she?

"Nha, only part of Midori knows what's going on in the post-mortem world, and I can't seem to bring my memories over here. I only partially understood what a soul was like, and I didn't fully grasp it."

Due to certain circumstances, I am not going to tell you everything, but Midori thinks of not telling lies, choosing words to answer.

"A lot of people recognize souls as human minds themselves or parts like human nuclei, and that's what most magicians think, isn't it? I don't think that's wrong either, but that's just one side, or more precisely, an absolutely indestructible and immovable storage device."

"Immovable?"

Junko leaks a surprising voice. The theory of the immortality of the soul is often heard by the pure child, but he did not understand the meaning to be expressed using the word immovable.

"Well, you can't erase the fact that the moment my sister and I are in conversation right now, no matter what, can you? For example, if there was a time traveler, even if history was tampered with, the fact that it was there before it was tampered with could never be erased. And the fact of immobility is remembered by the soul. Even if forgotten from the brain, the memories engraved in the soul will never be erased. Why - and the soul is present on the other side at the same time as it resides in a person's body - I do not lose my memory or power when I am reincarnated because I wear the art of continuing to suck out of the other side the memories that are immovable and indestructible, engraved in the soul. Like I said, I can't bring in the memories of the Underworld."

"Hmm, I've often figured out my soul system that far. I get a little jealous."

I really admire Junko. But the truth is, I'm not jealous. The emotion of jealousy in the first place is already gone from the pure child. Or is it getting infinitely harder to feel?