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in: Gameplay, Events, 2024, 2025

Special Investigations: The Tree of Sephiroth

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Overview
Story

Special Investigations: The Tree of Sephiroth (特殊調査「セフィロトの樹」) is the continuation of the 1st Spec-Ops event in Blue Archive featuring Izumimoto Eimi, Akeboshi Himari, and Asuma Toki.

The event works similarly to the Schale Meeting With General Student Council Mini Event, where Teachers don't need to clear event stages but rather gain limited currency through spending AP on Mission Stages and Commissions.

Blurb[]

⁠

“Hello, Sensei. This is our new base.”

~ to Sensei, Visiting

“A new mission, a new environment... Let's get started, Sensei.”

~ to Sensei, Visiting

“Sensei, could you please lend me a hand? Oh, even a super genius, innocent, frail beauty like me needs a hand.”

~ to Sensei, Visiting

“We have confirmed the increase in conditions. Let's proceed carefully to see how far we can reduce the variables.”

~ to Sensei, Tapping

“The more information the better, but... If too much is given to you all at once, it can be a bit of a problem.”

~ to Sensei, Tapping

“I'm feeling a little tired... I would be so happy if I had a Sensei who would let me rely on them at times like this.”

~ to Sensei, Tapping

“It would be a grave situation for me, the best hacker and the most beautiful girl, to be without the best partner. So, Sensei, I'm... Nothing...forget what I just said.”

~ to Sensei, Tapping

“I guess you could say we've entered a new phase.”

~ to Sensei, Tapping

⁠

“Hello Sensei. How is the new base?”

~ to Sensei, Visiting

“Welcome back, Sensei. Please feel free to ask me anything.”

~ to Sensei, Visiting

“There's so much to do... let's tackle it one by one.”

~ to Sensei, Visiting

“President Himari looks busy... But it looks like fun, so I guess it'll be okay.”

~ to Sensei, Tapping

“If you're cold, come over here, Sensei. I think it'll be more efficient for both of us.”

~ to Sensei, Tapping

“Temperature and conditions are closely related, so it's comfortable here and I like it.”

~ to Sensei, Tapping

“Good job, Sensei. Can I see that?”

~ to Sensei, Tapping

“With Sensei around, the success rate of our operations increases... I'm in good shape too.”

~ to Sensei, Tapping

⁠

“We have been waiting for you, Sensei. We promise to provide you with perfect assistance no matter what the terrain or climate.”

~ to Sensei, Visiting

“Sorry for making you wait, Sensei. I'm fine. I'm not sulking. I have no intention of ever leaving your side when you get back, so don't worry.”

~ to Sensei, Visiting

“Please think of it as a big ship and leave it to me... Otherwise, it will be lonely.”

~ to Sensei, Visiting

“There is heaven, there is earth, there is Asu, Uma, Toki.
...There is no meaning. I just said it.		”

~ to Sensei, Tapping

“I'm often asked if it's cold, and I tell them it's fine, but it's actually cold. So please warm me up, Sensei.”

~ to Sensei, Tapping

“My job is to manage and guard the base. In other words, to stick closely to the Sensei. Is that a weird idea? Sensei still has a long way to go.”

~ to Sensei, Tapping

“I'll get straight to the point: you need to focus on me right now, because it's just me and you here.”

~ to Sensei, Tapping

“Sensei, give your hands here. I'll warm them for you.
...! ...Your hands... aren't they cold...?! Ugh... I should have hidden your gloves back then.		”

~ to Sensei, Tapping

⁠

“I wonder if I'll be joining midway through.
...I'll be counting on you from now on, Sensei.		”

~ to Sensei, Visiting

“You are a person who can be punctual.
That is the most rational thing to do.		”

~ to Sensei, Visiting

“This is Himari's...
No, our base.		”

~ to Sensei, Visiting

“...I still can't believe it.
That I'm part of the same operation as Sensei.		”

~ to Sensei, Tapping

“...Everyone has been very nice to me.
It's not that I dislike it, but...
It's true that I'm a little confused.		”

~ to Sensei, Tapping

“Outside of the field of engineering...
Sorry, I don't know much about it.		”

~ to Sensei, Tapping

“...What is it? ...Did you just want to talk to me?
Please refrain from such irrational behavior, sir.
...I wouldn't go so far as to say I find it unpleasant.		”

~ to Sensei, Tapping

“Before, I thought I had to master everything.
But now... I've realized the limits of what one person can master.
I wonder if it's all thanks to you, sensei.		”

~ to Sensei, Tapping


Event Details[]

Information[]

⁠

  • Event Period: November 06th, 2024 JST ~ November 20th, 2024 JST
  • Rewards Period: November 06th, 2024 JST ~ November 27th, 2024 JST
  • In this Event:
    • Unlike the usual events, this event does not have any combat stages and simply requires teachers to consume their AP

Event Guide[]

  • This event requires Teachers to consume AP in either Mission or Special Request to obtain Mysterious Substance ⁠.
    • The conversion rate is 1:1.

Box Gacha[]

⁠

“We changed the direction of our analysis a little.”

~ to Sensei, Visiting

“Chance and necessity, absolute theory and relativity...
It's a fascinating subject, don't you think, Sensei?		”

~ to Sensei, Visiting

“Why don't you try your luck too? According to astrology, today's lucky color is...
...Huh? Is that okay...?		”

~ to Sensei, Visiting

“Probability and statistics govern most things, astrology and even lotteries are no exception.”

~ to Sensei, Tapping

“I disagree with the idea that everything should be controlled.
I believe there is value in encountering a world that has yet to be seen.		”

~ to Sensei, Tapping

“It's unknown territory...
It's fascinating.		”

~ to Sensei, Tapping

“Even though science has unlocked many mysteries, there will always remain areas of the unknown...
Otherwise it would get boring.		”

~ to Sensei, Tapping

“One day we will reach our goal and then...witness the birth of yet another goal.”

~ to Sensei, Tapping

“Even if the results are statistically obvious, we are free to feel happy about them...
That's wonderful, Sensei. I'm happy too.		”

~ to Sensei, Obtaining Rare Item

“Oh, so this is what they call a "winner"?”

~ to Sensei, Obtaining Rare Item

“Congratulations, Sensei. Even though we could have predicted the outcome, surely it's okay to be happy when you realize your success?”

~ to Sensei, Obtaining Rare Item

“The reason we can feel "special" is because there is "normal". So please treasure the "normal", Sensei.
...And also, about that super genius, innocent, sickly beautiful girl who is having a hard time.		”

~ to Sensei, All Rewards Obtained

Mysterious Substance ~ Refresh 1 / 3 / 5
Price ~ ⁠ x8 Total Price ~ 250
x3
x1
x1
x1
1 Time 50 Times 35 Times 15 Times
x1
x1
x1
x1
8 Times 30 Times 12 Times 6 Times
x1
x1
3 Times 90 Times

Mysterious Substance ~ Refresh 2 / 4 / 6
Price ~ ⁠ x8 Total Price ~ 250
x3
x1
x1
x1
1 Time 50 Times 35 Times 15 Times
x1
x1
x1
x1
8 Times 30 Times 12 Times 6 Times
x1
x1
3 Times 90 Times

Mysterious Substance ~ Refresh 7+
Price ~ ⁠ x8 Total Price ~ 250
x1
x1
x1
x1
100 Times 50 Times 20 Times 15 Times
x1
x1
x1
x1
7 Times 3 Times 15 Times 7 Times
x1
x1
3 Times 30 Times


Information[]

⁠

  • Event Period: February 03rd, 2025 JST ~ February 12th, 2025 JST
  • Rewards Period: February 03rd, 2025 JST ~ February 19th, 2025 JST
  • In this Event:
    • Unlike the usual events, this event does not have any combat stages and simply requires teachers to consume their AP

Event Guide[]

  • This event requires Teachers to consume AP in either Mission or Special Request to obtain Mysterious Substance ⁠.
    • The conversion rate is 1:1.

Shop[]

Exchange Shop[]

Teachers can exchange Mysterious Substance for various rewards.

⁠

“Here, we are analyzing the "materials" that Sensei has collected.”

~ to Sensei, Visiting

“Welcome back, Sensei. Ah... I'm tired of waiting.”

~ to Sensei, Visiting

“Have you collected any samples yet? Please leave them here.”

~ to Sensei, Visiting

“Thank you for your continued cooperation, sir.”

~ to Sensei, Tapping

“Well, I wonder what kind of information will come out.”

~ to Sensei, Tapping

“Thanks to you, the investigation is progressing smoothly. Still, this phenomenon... is really interesting.”

~ to Sensei, Tapping

“Wow, I never thought I would be unable to keep up with the analysis...
What a luxurious environment we live in.		”

~ to Sensei, Tapping

“Exploring is always an exciting thing, and if you're joining me... well, needless to say.”

~ to Sensei, Tapping

“Analysis complete. Please take it.”

~ to Sensei, Buying

“Did you like the interpretation? Hehe, please come again.”

~ to Sensei, Buying

“I have analyzed it carefully for you, sensei.
Here, please accept it. ...I, I intend to keep my personal and professional lives separate, yes.		”

~ to Sensei, Buying

4 =

“Sensei collect samples, we analyze them, and then give them back to them...
This is how "bartering" is established.		”

~ to Sensei, Buying

“Thank you as always. ...What did you think?
A one-day store attendant service by a super genius, pure, sickly beautiful girl.		”

~ to Sensei, Buying

⁠

“This is where the things Sensei has collected are analyzed. Probably.”

~ to Sensei, Visiting

“The more samples the better. Thanks in advance.”

~ to Sensei, Visiting

“You've come to the right place. Do you understand that efficiency is important, teacher?”

~ to Sensei, Visiting

“Huh? What's wrong?...I just called you? Why...?
...Well, if that's what you want to do, then it's fine.		”

~ to Sensei, Tapping

“If you hold this and do that, something will come out.
...I don't really understand it either, but according to the manager's explanation, that's what it seems to be.		”

~ to Sensei, Tapping

“I don't have much to do during the analysis.
Can I sit on your lap?		”

~ to Sensei, Tapping

“They told me not to get too close during the analysis because my body temperature would be a variable.
...I know that, but it feels a bit lonely.		”

~ to Sensei, Tapping

“This place... I might like it.
Would it be okay if I brought part of the club room here?		”

~ to Sensei, Tapping

“Here you go.
...Is this what they call "bartering"?		”

~ to Sensei, Buying

“The results are in. Which one will you choose?”

~ to Sensei, Buying

“Yeah, that's good.”

~ to Sensei, Buying

4 =

“I wish there was more variety in the results.
Is the current state good enough?		”

~ to Sensei, Buying

“I don't really understand it, but I hope this helps teachers.”

~ to Sensei, Buying

⁠

“Welcome back, Sensei. Please leave the samples you collected here.”

~ to Sensei, Visiting

“Analysis requires a large amount of "substance," which means your help is needed.”

~ to Sensei, Visiting

“Sensei, would you like some tea?
This is brewed with water from a melting glacier.
It might have an ancient taste.		”

~ to Sensei, Visiting

“Since you conducted a similar experiment before, I feel a bit nostalgic about this mission.”

~ to Sensei, Tapping

“The teacher stole something very unbelievable... that is... my heart.
...Please don't panic. I was just saying, okay?		”

~ to Sensei, Tapping

“...You want me to do "that"? Are you sure?
Understood...hop.		”

~ to Sensei, Tapping

“I'm currently analyzing the samples, which means I'm bored.
...You know what to do, right?		”

~ to Sensei, Tapping

“I will protect you no matter what.
That is the only reason I am here.		”

~ to Sensei, Tapping

“Good.”

~ to Sensei, Buying

“I think that's good too.”

~ to Sensei, Buying

“If you think it will be useful to you, please feel free to take it.”

~ to Sensei, Buying

4 =

“Since it was chosen by Sensei, it must be valuable.
Of course, it can't compare to mine.		”

~ to Sensei, Buying

“It will be ready shortly. Please wait a moment.”

~ to Sensei, Buying

⁠

“Himari has handed me over.
Currently, mysterious substances created by the "Nameless Gods" are being found all over the place.		”

~ to Sensei, Visiting

“If we have samples, we'll be able to resupply.”

~ to Sensei, Visiting

“Please show me the samples you collected.”

~ to Sensei, Visiting

“I appreciate your cooperation.”

~ to Sensei, Tapping

“We're analyzing the "substance" from which we are producing by-products.”

~ to Sensei, Tapping

“This device gives off a lot of heat...
I think it might be a bit too much for Eimi.		”

~ to Sensei, Tapping

“I have no complaints about the structure of the device.
Surprising? Even I can honestly admit that something is excellent.
Ah, but I wish the design and details were a little more rational...		”

~ to Sensei, Tapping

“..I don't think there's anything to be gained by doing something like that.
...Can you see the change in my expression?
...I understand why people say I've changed.		”

~ to Sensei, Tapping

“These are the results of this analysis.”

~ to Sensei, Buying

“Welcome, which one would you like?
...I was just trying to imitate you. Forget what I just said.		”

~ to Sensei, Buying

“I wonder if bartering in the past was like this too.”

~ to Sensei, Buying

4 =

“A rational choice.”

~ to Sensei, Buying

“The final choice is up to you.”

~ to Sensei, Buying

Mysterious Substance⁠
Total Price ~ 15000
x3
x2
x1
x1
3 Times 100 Times 80 Times 50 Times
⁠ 200 ⁠ 1 ⁠ 5 ⁠ 20
x1
x1
x1
x1
10 Times 100 Times 80 Times 50 Times
⁠ 100 ⁠ 1 ⁠ 4 ⁠ 15
x1
x1
x1
x1
10 Times 90 Times 36 Times 18 Times
⁠ 60 ⁠ 5 ⁠ 15 ⁠ 50
x1
x1
x1
x1
6 Times 90 Times 36 Times 18 Times
⁠ 100 ⁠ 5 ⁠ 15 ⁠ 50
x1
x1500K
x1000K
x750K
6 Times 1 Times 2 Times 4 Times
⁠ 100 ⁠ 600 ⁠ 450 ⁠ 350
x500K
x250K
x1000
5 Times 5 Times N/A
⁠ 300 ⁠ 150 ⁠ 1

Information[]

⁠

  • Event Period: May 07th, 2025 JST ~ May 14th, 2025 JST
  • Rewards Period: May 07th, 2025 JST ~ May 14th, 2025 JST
  • In this Event:
    • Unlike the usual events, this event does not have any combat stages and simply requires teachers to consume their AP

Event Guide[]

  • This event requires Teachers to consume AP in either Mission or Special Request to obtain Mysterious Substance ⁠.
    • The conversion rate is 1:1.

Box Gacha[]

⁠

“We changed the direction of our analysis a little.”

~ to Sensei, Visiting

“Chance and necessity, absolute theory and relativity...
It's a fascinating subject, don't you think, Sensei?		”

~ to Sensei, Visiting

“Why don't you try your luck too? According to astrology, today's lucky color is...
...Huh? Is that okay...?		”

~ to Sensei, Visiting

“Probability and statistics govern most things, astrology and even lotteries are no exception.”

~ to Sensei, Tapping

“I disagree with the idea that everything should be controlled.
I believe there is value in encountering a world that has yet to be seen.		”

~ to Sensei, Tapping

“It's unknown territory...
It's fascinating.		”

~ to Sensei, Tapping

“Even though science has unlocked many mysteries, there will always remain areas of the unknown...
Otherwise it would get boring.		”

~ to Sensei, Tapping

“One day we will reach our goal and then...witness the birth of yet another goal.”

~ to Sensei, Tapping

“Even if the results are statistically obvious, we are free to feel happy about them...
That's wonderful, Sensei. I'm happy too.		”

~ to Sensei, Obtaining Rare Item

“Oh, so this is what they call a "winner"?”

~ to Sensei, Obtaining Rare Item

“Congratulations, Sensei. Even though we could have predicted the outcome, surely it's okay to be happy when you realize your success?”

~ to Sensei, Obtaining Rare Item

“The reason we can feel "special" is because there is "normal". So please treasure the "normal", Sensei.
...And also, about that super genius, innocent, sickly beautiful girl who is having a hard time.		”

~ to Sensei, All Rewards Obtained

⁠

“Now let's change the way we look at the samples a little bit.”

~ to Sensei, Visiting

“A place where you can try your luck... What?
The only thing that's uncertain is the future.		”

~ to Sensei, Visiting

“Let's take a chance on your luck, Sensei.
Then, please do the same for me.		”

~ to Sensei, Visiting

“It seems like Director Himari has changed something...but I personally find it a bit disappointing.
I like it when the results are clear.		”

~ to Sensei, Tapping

“Toki seems to like this method...
Toki is the type of person who enjoys almost anything, even if it doesn't show on his face .		”

~ to Sensei, Tapping

“I don't know much about the methodology, but I can tell that something has changed.”

~ to Sensei, Tapping

“If I get a bad ticket, I might leave you behind.
...I was just kidding. Whether I'm lucky or not, I'll be by your side.		”

~ to Sensei, Tapping

“If you don't like the results, tell me. I'll comfort you.”

~ to Sensei, Tapping

“You won! Congratulations, Sensei.”

~ to Sensei, Rare Item

“The jackpot really did exist...”

~ to Sensei, Rare Item

“I was surprised... You are really lucky, Senei.”

~ to Sensei, Rare Item

“This is a result of your efforts and ours.
Congratulations, Sensei. Shall we have a toast?		”

~ to Sensei, All Rewards Obtained

⁠

“This is where Director Himari made some "minor adjustments."”

~ to Sensei, Visiting

“Random or fixed...which would you choose, teacher?”

~ to Sensei, Visiting

“It's a test of luck. I'll take on the misfortune, so good luck should come your way.
...But it has to be the other way around...? Is that right?		”

~ to Sensei, Visiting

“I'm slowly beginning to understand the difference between Director Himari and Lady Rio.
I still don't know which one is right, but...when I think about the two of them, somehow...
I feel an emotion that I can't put into words.		”

~ to Sensei, Tapping

“I heard somewhere that we need a little bit of luck in life, otherwise we will live a hard and painful life.”

~ to Sensei, Tapping

“Whatever the outcome, I'll be on your side, so please be on my side too.”

~ to Sensei, Tapping

“When I finish this mission... I'm going to live happily ever after with my teacher.
A flag...? What is that?		”

~ to Sensei, Tapping

“Please choose whatever you feel like. That is the correct answer.”

~ to Sensei, Tapping

“Oh, clap, clap, clap, clap, clap... That was my best celebration yet.
How do you like it? Were you moved?		”

~ to Sensei, Rare Item

“Well done, Sensei. Let's keep up the momentum and try again.”

~ to Sensei, Rare Item

“Congratulations on the second prize.
What is the first prize? A voucher for me to assist you with your daily needs for a day.		”

~ to Sensei, Rare Item

“That's an indomitable spirit... I want to emulate that.
Don't you think it's great that a student shows respect with such pure eyes? Please praise them quickly.		”

~ to Sensei, All Rewards Obtained

⁠

“Here, we use a slightly unusual analytical methodology, which can be summed up in one word: chance-based sampling.”

~ to Sensei, Visiting

“The possibility of losing money in a lottery has been proven by probability theory...
But, there's nothing we can do about it now.		”

~ to Sensei, Visiting

“...Himari's tastes haven't changed.
...Multifaceted consideration is necessary. Yes.		”

~ to Sensei, Visiting

“The inability to accurately predict the analysis results is a bit disappointing as someone who participated in the Seminar.”

~ to Sensei, Tapping

“If the results aren't what you expected...
There's nothing I can do. I'll apologize in advance.		”

~ to Sensei, Tapping

“"God does not play dice"...
This proposition is considered false, but I agree - in some aspects.		”

~ to Sensei, Tapping

“Quantum mechanics is not something to understand...it's something to memorize.”

~ to Sensei, Tapping

“The world is something outside of human perception...
Yes, just like this analysis that relies on chance.		”

~ to Sensei, Tapping

“...That's...! Really...?”

~ to Sensei, Rare Item

“The law of large numbers, right?”

~ to Sensei, Rare Item

“Keep drawing until you get it...?
In theory, that's not wrong, but...		”

~ to Sensei, Rare Item

“Most of the world exists within a normal distribution...
Nice work, Sensei. Congratulations.		”

~ to Sensei, All Rewards Obtained

Mysterious Substance ~ Refresh 1 / 3
Price ~ ⁠ x8 Total Price ~ 2000
x3
x1
x1
x1
1 Time 50 Times 35 Times 15 Times
x1
x1
x1
x1
8 Times 30 Times 12 Times 6 Times
x1
x1
3 Times 90 Times

Mysterious Substance ~ Refresh 2 / 4
Price ~ ⁠ x8 Total Price ~ 2000
x3
x1
x1
x1
1 Time 50 Times 35 Times 15 Times
x1
x1
x1
x1
8 Times 30 Times 12 Times 6 Times
x1
x1
3 Times 90 Times

Mysterious Substance ~ Refresh 5+
Price ~ ⁠ x8 Total Price ~ 2000
x1
x1
x1
x1
100 Times 50 Times 20 Times 15 Times
x1
x1
x1
x1
7 Times 3 Times 15 Times 7 Times
x1
x1
3 Times 30 Times


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V • T • E

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