'Kronos Noir'.

　The Black Crown. Its abilities are time control and interference with parallel worlds.
　For a short period of time (one minute), it can summon various things from all times and worlds.
　It is capable of invoking and amplifying not only mere objects, but also "weight," "resistance," "shock," "otherworldly selves," and more. Although it is an immense ability, it can only be used at night, and it comes at the cost of the contractor's physical time rewinding.
　He can control time by seeing a few seconds into the future, making himself move faster, slowing down his opponents, etc., but apparently he can't stop time or go backwards "yet".

That means.

　Dr. Babylon moved to the right from the position he was standing in and stood in a different position and pointed to where he was standing and where he had just stood.

I'm in this position called A right now. But a second ago, I was standing at the point B before that.
"Mmm-hmm.
And a second ago, I existed in the position C, and another second ago, I existed in the position D. So each one of them is one second ahead of me, two seconds ahead of me, and three seconds ahead of me. The ability of the Black Crown is the ability to pull various things from this world of different times into my time. It pulls me from one, two, or three seconds ago to the world of the present, and locks me in place temporarily. This allows me to pseudo-presence four people in this world.

　Four doctors. It's a nasty world.
　Hmmm..... I don't understand what you're saying, but if you can pull yourself from one second ago, wouldn't the one second later, that is, the present you, not be there?

The flow of time is the same, but there are endless tributaries of possibilities. For example, I'm here right now, but one second later, I'm in front of you, behind you, to your right, to your left, and so on.　At this time, if I moved forward, calling for me to go to the right, left or back when I was supposed to go to the right, left or back, I wouldn't be able to shake my presence.

　Ah, a parallel world. You know, the kind you see in the movies and comics about time machines.
　It's called a time paradox, right? And what happens if you go back in time and kill your parents, before you were born?　Or something like that.
　In this case, you are killing your parents, so you will never be born, and therefore your parents will never be killed.... A contradiction arises.
　However, if you think that when you killed your parents, you branched off into a different world than the one from which you started, the contradiction does not occur. The world where my parents were killed and I didn't exist" and "the world where my parents were not killed and I exist".
　A world of "what ifs" with all sorts of possibilities. So the ability of Noir is to interfere in that world and pull in various things.
　Isn't this a pretty amazing thing... It would have been terrible if we fought at night........no, there's a price to pay over there, and it's not that simple.

''It's different from the other world, isn't it?
'They don't exist in the same timeline, but the worlds are the same. Well, there may be any number of similar worlds in the myriad of worlds managed by what you call 'gods', and if they're far away, they may be called 'other worlds'.

　I see. So it's a world of possibilities. It's not a different world. You think of it as the same world in a different time line.

Is that the ability to defeat the Flaze 5,000 years ago?
'I doubt it. We've eliminated that swarm of hundreds of thousands of Frays from this world, even temporarily, and maybe they have yet another ability. It seems that even Engineer Elka couldn't figure that part out, and Noir himself seems to have had his memories reset. Well, the price is the price, so we can't try it lightly.

　Is this the price of the Crown Holder 《Crown Master》? Maybe the restriction of being able to use it only at night is a stopper on the contrary.
　By the way, I heard that the weapon that was used in the fight against me was a weapon made by the Elka Engineer, so it's not directly related to Noir.
　In Noir's case, it seems that every time he uses his nighttime ability (Golem skill), the physical age of his master, Norn, goes back. Then I can understand that Nari at fifteen years old.
　At first glance, it seems like a wonderful thing that keeps you young, but the more you use it, the more rejuvenated you become, and if you eventually become a fetus, it's no different than death.
　The fact that a fifteen year old girl looks only six or seven years old means that she has already been eaten by eight or nine years of time.
　When you think about it, it is a terrible price to pay. Maybe it's still better, though, because she'll grow up as time goes by.
　Because of this, it seems that age and height are taboo for her. She apologized to me after that, but apparently it was a reflex. (According to Noir.)
　Well, I remember seeing a movie I used to watch where the main character gets mad when someone calls him a "coward (chicken)". That movie was also about a time machine and time. He's some kind of relative or something...that's impossible.
　The Elka engineer was lectured or chastised by the norn, or whatever it was, he was angered endlessly. However, I could see a glimpse of his concern for his sister in every word, and I knew that he didn't hate her. That's it, Tsundere?　...or not in this case.

"So what does Miss Norn do?
The Elka technician said that since he doesn't want to leave Babylon, he's going to stay in the surface world for a while. I asked him if he wanted to live in the castle, but he said no. He said he was staying at the Silver Moon. It seems that he has taken up residence at the Silver Moon.
"Hmm. It would be nice to have the Crown close by. It would be nice to have the Crown in the vicinity to help us with our future plans. Well, that's just the way it is.

　The Doctor picked up a stack of papers on the desk in the Institute and flipped through them. That was a translation of the diary on a stone tablet left by Lelios Parellius, the founding king of Primula.

"The 'white' crown was left on the surface world [here] side...? Of course, you've already done a search, haven't you?
Yeah. But there was no reaction. I looked at the 'red', 'blue', 'black', 'purple' and the crown golems. They all had similar characteristics. I don't think 'white' was the only difference.

　The fact that it didn't get caught in the search magic under those conditions means that it's either already become something that can't be identified by appearance or it's been disturbed by a ward.
　The 'Black' and 'White' masters who came to this world five thousand years ago may have sealed it somewhere.

I'm not sure if this mysterious former master is the only one who has been here for five thousand years. The price of Noir, the crown of the Black, is the regressive time of the body. It is the power that repelled so many flames five thousand years ago. Of course, the cost would have been enormous. Even if the former master was a wobbly old man, I think it's highly likely that he would have reverted to a fetus.
What is it, then?　At that point, you're saying that the former master was too rejuvenated and just died?
I can't say for sure, of course, because it's possible that the former master is a long-lived species. But I think there is another possibility as well. In other words, is the cost of the 'white' crown the exact opposite of the cost of the 'black' crown?　That's what I mean.

　Huh?　When you say the opposite of physical time regression, do you mean "aging"?

It's also called 'aging.' In other words, by aligning these two crowns, the 'black' and the 'white', they were not limited by compensatory... well, I'm just guessing.

　Rejuvenation and Aging. Conflicting costs. If you multiply the plus and the minus, or the minus and the minus, does it mean that you get a plus?
　Well, it's just my imagination after all, and it's probably useless to think about it now.

I'm not sure how the plan to strengthen Golem is going?
Well, that's pretty good. Here's a sample model, just in case.

　The Doctor brings a robot with a large transparent crystal that looks like a round marble, with limbs and heads attached to the center of it.
　Overall, the design is different from the frame gear, and it has a rugged feel to it. Perhaps because it was a sample, there was no color on it. I wonder if they are going to use clear parts here and there.

I'm not sure if I'm going to be able to get it right," he said, "but the special gel with a high level of magic conduction wrapped around Golem and the contractor's "master" and then amplified in various parts from there... well, let's not get into the details. Anyway, it can give you power and mobility on par with Frame Gear, and can even enhance your ability 《Golem Skill》.
Yeah.
''However, when it comes to the 'crown,' it's difficult to do without careful experimentation. It's not funny if it's a hundred times more powerful and a hundred times more costly.

　That's for sure. I hope you'll be especially careful about that. If you make a mistake, the cost is too great for Norn's Noir and Nia's Rouge.

''This would work with ordinary golems, right?
No problem. This is the core part, and if you change the parts around it, you can recreate another form. For example, if we're going to base it on Erca's Fenrir, we can create an animal form like this.

　Saying that, the doctor pulled out a limb and head from the sample model and took out another part and snapped it into place.
　In the blink of an eye, the humanoid robot turned into a four-legged wolf-shaped robot. By reassembling the parts, it can be customized into various shapes.
　Would this be able to support various types of golems?　No, it may not be as good as Sancho's place, but it may not be as good as the cannibass.
　Still, it would be a much better way to counter the mutant species. You don't need to be a crown class to kill them. In the underworld, though, the boundaries aren't as torn down as in the surface world, so I don't think we'll be able to get out the big guns that often. Even so, there's a huge difference between having the means to intercept them and not having them.

''How complete is this?''
''About 60 percent.......... Well, like I said before, in the case of the crown, there's a lot of adjustment and experimentation to be done, and it's not quite there yet.

　That's about it. I don't want to rush you, but I also don't want to be on the back foot. All I can say is, hurry up as much as possible.
　After that, I left the Laboratory and headed to the Castle of Walls. It's time for our group to come to a conclusion.

''Hey, Winter Night. Long time no see.
I think I'd like a katsudon for dinner tonight.
'I just had that two days ago, Master Mel. As for me, I'll have some ramen.
Fish. I like sashimi. And a hot meal.

　I let out a small sigh as the four of them were completely relaxed. It's too adaptable..... I don't even want to complain when they are so familiar with each other.

.........So, in the end, the story is settled?

　He speaks to Ende as he looks at Mel, the 'King' of Frase, who is chewing on a cookie on the table and drinking a cup of tea, and the dominant species sisters, Nay and Lise, who are sitting across from him, also stuffing apple pie or something into their mouths.

'Nothing coherent. We haven't decided on a menu for tonight yet.''
You're not going to get it.

　Ende held up his hands in the air as if to say, "I'm overreacting, I'm overreacting. How about eating a snack and worrying about the dinner menu?

''If I can stay with Ende Muon, that's fine.
I still wish to return to the Crystal Realm, Master Mer. I'm sure many of my fellow countrymen will want that as well.
"So I'm telling you I'm not 'The King' anymore...

　That's a parallel line. There's nothing going on. Why, you guys are just going to eat?
　The three dominant species, who surpassed Ende, experienced the unknown experience of eating, and seemed to be fascinated by it, looking forward to three meals and a snack every day.
　I'm just enjoying the taste of the food, but in the beginning, I was asked to eat a lot of food. But at the beginning, we were asked to eat more than eight layers of beef. We were asked to eat ten head of beef every day.
　However, eventually I got used to tasting the food, and I could eat a small amount, but even so, the three of us ate enough for ten people.
　I wondered if they were the ones who were wasting their time eating. I'd like to free them, but it would be troublesome if they were to be taken in by mutants or evil spirits without their knowledge.
　But if you don't let them eat it, it makes you feel bad, like you're being bullied.

''Is there anything unusual out there?''
There's nothing there yet. Though mutant species are beginning to appear here and there in the underworld as well.

　As I answered, I sat down in front of the sofa where Ende was sitting. I feel like the house is being eaten by termites. Let's call it a state of affairs that could collapse at any moment.

Have all the other flames already been taken in by the mutant species?
'The ones Ney and the others had with them, yes. It's usually a few hundred thousand. The ones that were 'eaten' by the mutants.

　Hundreds of thousands........that's a lot. Moreover, according to what I've heard, it seems that the lower-grade breeds of flames take a long time to grow. I hope that point hasn't been strengthened by the fact that they've become mutants.
　Anyway, we can't get any more crystal materials? I have a mountain of it, but I'll have to think about how to use it.
　But these guys have become completely accustomed to living under house arrest. Perhaps this is because they are a long-lived species, or perhaps they are used to boredom.
　On the contrary, Mel seems to have borrowed some books from the keeper of the "library", Pham, and is reading a lot of things.
　Like the so-called Dr. Babylon and the ELCA engineers, she seems to be a 'genius' of her race, and her understanding of the subject is outstanding.
　She's also the one who originally devised a way for the Freys to cross the other world. It's hard to imagine her gobbling up a cutlet bowl or something.
　It's a fine line between genius and whatnot.

But that's not the point. It's time for you to let me out 'outside'.
So... If Mel or anyone else goes outside of the [Prison], they'll be noticed by the mutants. You're putting this country in danger?
No, no, no, I'm aware of that. I know that. I mean, it's just me.

　Hmmm..... Well, I don't think Ende is going to leave Mel and run away or anything like that. It's easy to change the [Prison] setting so that only Ende can come and go at will, but why again?

Training..... I have a certain amount of pride in myself. If I have a chance to fight those twins again, I want to make sure I'm strong enough to not lose next time.

　So that's the twin, or the twin of the dominant species that Ende got beaten to a pulp. It's said that they've become a mutant species on Yura's side.
　He looks at me seriously, as if he was really frustrated.
　Well, I don't mind if you want to train on your own, but....

That's the spirit!
"'Whoa!'?

　A figure suddenly appeared next to me with a light and shouted so loudly that I couldn't help but shout in unison with Ende.
　I'm not going to be able to get it right. He had short hair and wore what looked like a white robe, and underneath he wore well-developed muscles. A man with a bowl on his forehead, thick eyebrows and sharp eyes, a mouth tied in a single letter, and a man who for all intents and purposes looks like a martial artist was standing beside me.
　''Who the hell is this guy who's invading the [Prison]!

''Ah!　Ah, you are........!
You know Ende?
It's him!　The one that beat me to a pulp when I got the divine sword!
Long time no see, boy!

　The martial artist smiles a somewhat hot smile and snickers.
　You said you beat up Ende........wait a minute, that means.......

''No way........Bushin.......?
'How!　There, he humanized and descended to fulfill the boy's wish!

　Yes, the seventh god is here.
　It's already over capacity.......what, are you trying to get the Seven Lucky Gods of another world?　The location of Bishamonten?　I guess Hanakoi's sister is Benzaiten.

"Now that I'm here, you can relax. I'll imprint on you what strength is!

　Ende, who was pointed at by Bishin, drawled and said, "Me? He pointed to himself.
　Well, the World God said that he wanted to be a disciple or something, he said. I wonder if he's been trying to find the right time to get down to earth.
　Sorry Ende, but a god who doesn't touch you is not possessed. If that's the purpose of the warrior gods, then let's let them flaunt their skills to their heart's content. You want to be strong, and you don't want to be a god's apprentice, do you?
　...the sacrifice is a lot for one person.