———Suddenly, I thought.
A festival where powerful warriors gather to fight.
A temporary enjoyment in between the battles to save humanity.
It's a very precious time. Simply fighting without worrying about anything.
Healing daily fatigue and wiping away the stress from their mission.
It's a wonderful thing. This festival is necessary. Yes, I know this event is very important.
That's why I think... I want to be of help.
My power is not what it used to be when I was alive, but even so I want to help you.
I don't want to get in your way. I just want to be useful. I want to become stronger. I want to activate that function.
That's why I———
>The speaker shows herself
Mashu?:
——————won't stop. I can't stop anymore.
I'm the daughter of the god Odin, a warrior maiden (Valkyrie) created by him.
A tool that belonged to the gods and was automatic. One day I met someone I learned to love and died as a woman.
I'm the Heroic Spirit Brynhildr. Someone who has lost almost all of her divine authority.
Because of that, part of my powers are sealed. There are functions I don't have the authority to start. I want to wake them up.
Tonight, the conditions to do so will be achieved.
A great number of heroes and warriors have gathered to fight.
One of them have to be chosen. You, the one who continues to observe these great men fight will bear witness of this.
Tonight, the most powerful hero will be chosen.

>She reveals her true form
Brynhildr:
Don't worry, I won't be taking anyone's soul. My father's place of resting (Valhalla) is far away from here.
If I were to use my Primal Runes it'll be possible to do it.
And when I do, I will be destroyed soon after...
But that's fine. I'll get this done before I completely disappear.
For your sake, I—————— will create the strongest Heroic Spirit.
>(Mashu!)
Brynhildr:
It's fine. I'm serious.
There is nothing to worry about. Leave everything to me, senpai.
So please don't look at me with those sad eyes.
Mashu:
...the remodeling of a Heroic Spirit. Without a Holy Grail, that would be impossible.
I see how it is. I understand now.
You choose the strongest Servant in Chaldea and use your Primal Runes to permanently reinforce them.
What you're trying to do is probably something like that. It's just like what Scathach-san and El Melloi-san were saying.
>(Another Mashu?!)
Mashu?:
Senpai.
Mashu:
No, Brynhildr-san.
I'm Mashu Kyrielight! You're a Heroic Spirit, the warrior maiden from Northern Europe!
Senpai seems confused as well. That must be the effect of a rune too.
Brynhildr:
.........
Mashu:
No real damage has been done yet. Although I should say I think using Nero-san's tournament for this kind of thing was horrible.
But you still have time to laugh and forget about this. Nothing has happened yet.
——————Please, Brynhildr-san.
Brynhildr:
...You're a special girl, Mashu.
You're not full of courage, but determination.
Like a modern day valkyrie.
But I'm sorry. I'm truly sorry.
I have already activated the function! Hero selection! Hero reinforcement! It will soon be time!

Mashu:
Brynhildr-san...!
Brynhildr:
I can't be stopped! I can't stop!
Chaldea's strongest Heroic Spirit will be remodeled and born anew!
Mashu:
It's impossible for a Heroic Spirit to do such thing! Scathach-san and El Melloi-san said it!
You should know already! All you're gonna do is disappear! So before it's too late, stop this...
???:
She's not a woman who would do so because you tell her to. She's very stubborn.
Mashu:
!? That voice——
Altera:
I have records of how to deal with this kind of situation.
We will be done soon. The tournament will resume and the food stalls will open again.
Their food is, probably, good civilization.
Mashu:
Altera-san!
Siegfried:
I stopped hearing a whisper saying "Sigurd, Sigurd..." during the tournament and wondered what happened.
I can't believe this is happening to you, Brynhildr.
I'm sorry. I failed to notice the predicament you were in. However, I will not overlook it anymore.
Mashu:
And Siegfried-san too!
Scathach:
Of course, it's not only them.
Leonidas:
As I thought, there was something weird! The atmosphere around Mashu was too strange! And I caught a glimpse of a magical spear!
Shield + Spear = Me! Thus, according to my calculation she can't be Mashu!
Mashu:
Leonidas-san! Scathach-san!

Leonidas:
We didn't come here alone! Other Heroic Spirits who saw what was happening to Brynhildr-dono too——— Are here!!
Robin:
I feel strange by being introduced in such a dignified manner, you know?
Passionlip:
Umm... I was curious as to what you were doing so I followed you... You were looking at her very intensely, like a pervert.
Robin:
Don't call me pervert, at least say stalker!
Passionlip:
Um... You were looking like you were in a bad mood after seeing Mashu...
Robin:
It's like this in Chaldea too. I have to assert everyone's condition.
"Who's giving me a bad feeling", "Who's movements are suspicious", "Who's acting strange", and so on.
It's part of being a scout. I can't overlook any sign of who could be a traitor.
Passionlip:
So that's why... You always look like you're sick in the dinning hall... It's very disgusting...
Robin:
Did you not listen to what I just said!? I bet your intelligence went to your boobs!
Passionlip:
(pouting) It didn't! Please stop being mean to me!
Suzuka:
Seriously. You are taking this domestic violence a bit too far. Get a hobby or something.
What, are you like, a beast? You have a rivalry going with that miko fox?
Robin:
Of course not, I'm like a hunter in the forest. My rivalry with that fox is simply who's getting hunted or killed first.
Leonidas:
Passionlip-dono and Suzuka-dono seem to be really close to Robin-dono. Were you three fighting together?
Anyway, Mash, Guda, the French group is also coming!
Gilles:
As the Saints say, we will not hesitate. We heard a valkyrie from Northern Europe was lurking in the shadows of the tournament———
D'Eon:
"I want you to be at peace. If you don't stop now, there will be nothing left of you. Someday, let's enjoy tea together." is my Queen's message for you, Brynhildr.
Brynhildr:
....

Leonidas:
We still have lots of brave men here! Take a look!
Alexander:
Here I am! I'm not the only one! Come on, sensei! Don't stay at the back!
Waver:
...Don't make a Caster come at the front.
But well, I see now. Brynhildr of Northern Europe. If you are truly in possession of Primal Runes, then avoid using them at full power at all costs. They hold the power of the god Odin, the highest existence in Scandinavia.
In the worst case, not only you will destroy yourself, but also Chaldea will be affected by abnormalities.
If that were to happen, of course Master won't be able to survive. For example, the energy flowing through a Magic Circuit might start going backwards.
Even phenomena that normally wouldn't occur might happen due to the Primal Rune's power.
But why is this happening in the first place? I don't think that woman is so crazy to do————
Ko-Gil:
Your lesson is getting too long, sensei!
Waver:
I don't remember making you my student. And on top of it you are King Gilgamesh. How ironic.
Alexander:
Well well. Don't say that, sensei. Gil-kun was simply worried and came here to help!
Waver:
Gil-kun...? You...
Leonidas:
Oh, looks like a pair of students and their teacher from the modern world have come!
What do you think, Brynhildr-dono? Even demi-gods have come here for you!
In sight of Mashu's and everyone else's determination, would you consider lowering your spear?
Brynhildr:
....

Altera:
It is as this wise king has said, war maiden.
I heard that according to a legend on Earth, you're the equivalent of my "young sister".
I have no memory of that as I am now, but there might be some kind of relationship between us.
If you were to stop working right here it would be troublesome. I haven't talked with you yet,
————my sister.
Brynhildr:
...Altera-sama. (Atli)
A person who smells similar to Sigurd.
No, I must suppress my feelings towards Sigurd right now.
There is something I must accomplish no matter what.
...Though I also would like to talk with you, but————
Hector:
If you want to talk with her you should. It's a festival, there is no better time to have a good time.
We can solve this. We can get all along. I won't say anything bad.
Well, if it is impossible then it's impossible. I don't really mind.
Beowulf:
Ah, this is so complicated! I don't care anymore, we can solve this by punching her hard enough!
Kintoki:
You're too short tempered, Beowulf! It's not smart to solve a woman's problems with violence. Riders are supposed to be heroes, dammit!
Beowulf:
It doesn't matter if she's a woman or a Heroic Spirit! Also, I'm sorry but I'm a Berserker!!
Hijikata:
Hm... There are things you can only solve by talking. That being said, if it is impossible then all you have to do is KEEP PUSHING WITH EVERYTHING YOU HAVE UNTIL THE VERY END!
Emiya:
————Certainly. That woman is not a child anymore.
I'm always ready to fight. Heroic Spirits, humans, it's all the same.
Of course, attempting to communicate first would be preferable.

Ozymandias:
AHAHAHAHAHAHAAHAHAHAHAHA! Hahahahahaha, this is so funny my stomach hurts!
That woman dared to point her spear at my temple! Words alone aren't going to stop this!
Arash:
Well, that's probably the case. I agree.
Oh, Master you're here too. If you are planning to help her return to normal, do it quickly!
Arthur:
You're right. Her spear hasn't gotten big yet. In other words, she doesn't have the power to take us all on a fight.
If you want to stop her, you have to do it before it's too late. What to do is up to you, Master.
Ozymandias:
Hm? I don't recognize you. Eh? Wait, that armor, that voice, that presence———— Could it be you are——————
Arash:
Yes yes save it for later! We have to focus on her first!
Brynhildr:
......
>(You don't have to do this!)
Brynhildr:
....I'm troubled. Ah, what should I do. Master is saying my actions are unnecessary.
If you look at me that way, I won't be able to keep going. Yes, this selfish behavior will too be gone very soon————
——I think I want to stop, but at the same time,
——I think we should create the strongest Heroic Spirit right now.
Mashu:
You can't, Brynhildr-san!
Brynhildr:
I'm sorry. I'm sorry.
I can't control myself. I am an unstable Heroic Spirit.
It starts automatically. I love automatically.
Scathach:
Her magical power is increasing...! Master, her Primal Runes are activating!
Altera:
Master, your orders. There is no other choice but to let our swords talk.
>(Stop her!)
Altera:
Understood, Master!
Brynhildr:
...Point your blades at me. Let me witness your power! To those who I am about to take their lives, be blessed by the heavens!
Warriors! Be chosen by me! Heroes, please stop me! I, I, I, I, I, I, I, ——————————I!
>(Brynhildr!!)
Brynhildr: MASTER...!!

Moriarty:
And like that, the valkyrie going out of control was brilliantly stopped by Master and Chaldea's staff.
The valkyrie is safe, including her spiritual core. She decided to not activate her Primal Runes.
I was about to witness something very interesting. Then everyone lived happily forever after. The end.
It seems Lord El-Melloi reached the conclusion her going out of control was caused by an external force, but unfortunately he could not pinpoint the cause.
After all that happened Chaldea remains at peace. Every system, including Shiva, is working normally————
It does not seem you will be able to get the coordinates of a new Holy Grail.
I feel like you raised my expectations for nothing.
Amakusa:
...What could you be talking about? If I recall correctly, I just said "something might happen" before the tournament began...
I never said I was getting involved. More than anything, I'm glad everyone is safe.
Moriarty:
Well, let us leave it at that.
I was curious to see what were you going to do after obtaining a Holy Grail but... Haha. You are more shrewd than what I thought.
Amakusa:
Well then, I will take my leave. I hope you enjoy this festival until the end.
It's a moment to have fun and relax, everyone needs a rest every now and then.
Until later.
Moriarty:
————Seriously, that man is so cunning. Interesting. Now then, it is time to relax.
Even if you are hiding I know you are there, detective.

Holmes:
It is rare for you to not try to run or hide. Did your nature change upon becoming a Servant?
Whatever the case is, I know you are the perpetrator. It was you who messed with Brynhildr and tried to make her go out of control.
Moriarty:
And your evidence is?
Holmes:
There is none, of course. As expected of you.
However, I still arrived at the truth. Lord El-Melloi II joined me as well in the role of detective.
His reasoning by using a magical approach was quite interesting to see. Anyway, even without clear evidence, in some cases it is possible to find the real culprit.
Even if it was impossible for a normal person, it is not for the great detective. You know this without me telling you, right?
Moriarty:
Hm. So you are saying you figured everything out?
Holmes:
Whether her going berserk being stopped at the last second was part of your plan or not, that I do not know.
Moriarty:
Better luck next time!! (runs)
Holmes:
Baritsu!! Gentleman kick!
Moriarty:
Aiming at an old man's back...! Isn't this foul play!?
Holmes:
As Irina said, it was a good idea to participate in the tournament. I learned to control my body better!

Brynhildr: Master. Once again, let me apologize.
I guess I'm really an unstable Servant. But I will try to not cause you any problem from now on.
Leonardo Da Vinci gave me this gift. It's using some of Chaldea's resources to monitor whether my working condition is normal or not.
It might not be perfect, but you should be able to be at ease.
If I start to act strange again... Please do not hesitate to break me. Until that day, I will be your strength.
>(I will not break you)
Brynhildr: Yes, Master.