A/N: Well, this got ridiculously huge. Hope you don't mind.
Nothing immediately springs to mind. I don't believe I can improve on Fumi's plan, but there are three possible ways it could fail that I may be able to limit given an hour's work. Installing a new charm is something I'd be able to do while you are socializing; however, some of them have potential drawbacks you should be aware of in advance. You would be reaching beyond your capacity in ways that require me to override safety logic. Though, that is likely to be the case regardless.
The best approach may be to ask the experts what the most likely vector of attack is.
Ask the experts? She guessed that meant Fumi, or maybe Hotsuin. But Fumi was really busy, and Hotsuin...
She spoke up before she could tell herself all the reasons why this was a bad idea. "Um, Hotsuin? One question, please?"
Hotsuin paused on his way out. "Yes?"
"Well, it's about the Conception. If I knew how the Demiurge is going to attack, I might be able to prepare… at least a little better…"
Hotsuin narrowed his eyes at her, making her quail inwardly, but she refused to back down. This was important! Besides, he was really just another teenager, there was no reason for her to care that much about his disapproval. She met his gaze squarely.
He frowned. "I would have thought Fumi had already explained all we know."
Fumi distractedly nodded.
"She barely told me anything," Amu complained. "Only what it'll try to do at first, not how it'll react to failing. I have to assume that it isn't dumb, and it'll try
something, but I don't know what it can do."
"Join the club," Hotsuin muttered under his breath. Louder, "It sounds to me like she did tell you everything we know. Which is to say, very little. We only know of its existence as a constant background to the world; there is no telling how it'll react to failure, or how strongly it'll strike back. But -" He smirked. "History shows that creatures of such might often have trouble even comprehending failure, let alone finding clever solutions. I would suggest being ready for indiscriminate brute force, if anything, but I can't predict the form of that force. If that will be all?"
He didn't look upset, but he did look impatient. She shrugged uncertainly and made to follow him towards the elevators, leaving Fumi to her struggles.
Some random spark of intuition made her look back after passing Fumi, for the first time giving her a good view of her work. Text chat, video chat, text chat, source code of some form, command prompt, more source code, another three terminal windows, web browser…
She cocked her head, looking more closely at the code Fumi was editing. Of course the language wasn't familiar, but if you assumed consistency…
"Shouldn't that be a semicolon?" She asked, pointing at a misplaced apostrophe. Fumi paused in her typing, nodded, corrected it and moved on. She thought for a moment. "And there, the exit condition of that loop can't happen, because you're passing the flag by value instead of name." At least, that was the only reading that made sense of everything else she could see.
Fumi stopped typing, tapping her fingers on the keyboard. "It's set in a different thread. Weren't you going to talk to your friends?"
"Yes, but -" She wanted to help.
"Brook's law. Adding more programmers to a late project makes it later. I'll ignore the way you seem to understand a language you couldn't possibly be familiar with, seeing as I wrote it myself, but if you want to hang around I'd appreciate it if you'd keep your comments to the syntax only. There's no time to explain everything." She frowned unhappily. "What I'm doing now is adding contingencies; the main program already works, but as you heard, we don't know enough about what will happen. Now either stick around for the next hour, or leave."
Stay here for the whole hour? That -
Was unnecessary, actually. All she had to do was -
Trying to push Miki away, Amu found she was stuck. Confusion was just about to turn into alarm when the connection finally gave in and they tumbled apart. Literally, in Miki's case, tumbling in mid-air.
What was that? Her
mind felt tender, like she'd ripped off a band-aid too early.
'The effect of the seal?' Miki wondered.
They looked at each other, startled.
'
Can you hear this?' Amu tried, deliberately thinking
at Miki. This was the same as during her exaltation, when all four of them had been able to hear each other. It would be really useful if they could do that all the time.
'Ki͢
n͠
d ͝
o̷
f͘.'
Their connection quickly fuzzed out, then ceased entirely. Miki shrugged, as if to say 'Oh well'.
Fumi hadn't noticed anything. They grinned at each other.
"Actually," Amu said -
"How about we do both?" Miki finished. "The only thing I can do is look, and tell you if I spot something that's off, but that might still be helpful. If you don't mind, that is."
Fumi raised an eyebrow, looking between the two of them, then shrugged. "Sure, whatever."
Miki smiled, waving Amu away.
———
If the Demiurge will use brute force, given its position, that most likely means one of two types of assault. Either it will extend the time period it's suppressing reality, hoping you will fail; or, it will actively attempt to shape the seal into nothingness. There are of course any number of subtler measures it could take, such as throwing lightning at you, but that would both be far more difficult to defend against and against Hotsuin's recommendation.
Of those two, a shaping attack is the one that would currently be impossible to defend against. As such, I will endeavour to construct a feasible defence charm in the next hour, based on Integrity-Protecting Prana. Please note that this will likely reduce the effectiveness of Integrity-Protecting Prana on yourself, requiring some level of active control to prevent damage.
Incidentally, if there's anything you can do to awaken your newest Chara ahead of schedule, that might be useful. It does have some useful skills.
Amu nodded agreeably. She was almost back up - this was actually a really fast elevator - and any moment now she'd get to see her friends again. She wondered who Utau's brother was. He sounded a little scary, if he'd jumped on top of a car!
The smile that forced its way onto her face was something she neither was able nor wanted to suppress.
The door dinged open and she stepped out, revealing -
"Amu-chi!"
Amu stumbled back into the elevator, Yaya hanging around her neck. She hit the back wall hard, forcing the air out of her lungs. "Oof. Yaya!"
"Eheh, sorry." Yuiki Yaya stuck her tongue out, then slid off her and almost fell down. Amu grabbed the supposedly older girl and steadied her on her feet, regarding her with fond exasperation. "But I heard you were coming to see me, so I couldn't wait!"
"Not just you, Yaya. It
is good to see you, though." She pulled her in for a quick hug. "Am I going to get tackled by anyone else if I step outside?"
"Naah. It's just me, everyone else is listening to Utau." Yaya looked really excited. "Speaking of which, why didn't you tell me she was so good at singing? Let's get back there, now!"
The elevator doors soundlessly closed behind her.
"Well, I'd like that, but -" Amu smirked, turning Yaya around to see. "It appears we're going back down."
Yaya's eyes widened, and she looked pleadingly at Amu. "Noo~, that can't be! Did you bring me here to keep me captive? Let me go, I beg of you!"
"…What?" Amu stared uncomprehendingly at her.
"Well, I
did almost get kidnapped," Yaya pointed out. She wriggled out of Amu's grip and studied the controls for a second, then hit the open-doors button. "If Ran hadn't been with them, I really would have thought I'd been kidnapped. What was with that, anyway? They're adults, but they could see her… and when did you get minions, Amu?"
"Minions?"
"Henchmen, then?" Yaya suggested.
Amu shook her head. "They're not
my henchmen, and it's a long story. Let's get back to the others, I don't have a lot of time before I need to go back."
———
"The entire world? You're trying to save…"
She was sitting in a circle with the other guardians, as well as Ikuto, Utau, her parents, and of course everyone's charas. Minus Miki, who was still downstairs - and Su, who had taken it upon herself to "Make the best cup of coffee
ever!" Truthfully, Amu was a little worried of what she'd cook up; it wasn't beyond her to produce a cup with outright lethal levels of caffeeine, if she wasn't careful. Not that anything had ever gone wrong yet.
"That's, um…" She couldn't make herself meet Ikuto's gaze. Why was
he the apparent spokesperson, anyway? "No, we're only trying to save… Japan. And a bit of China. The Dragon Seal doesn't have the range to do anything more, we're already pushing it."
She could feel everyone staring at her. What she'd said meant… they were sacrificing everyone outside of Japan. At best, they were sacrificing everyone outside of Japan. At worst… well, hopefully it wouldn't come to that.
"It does explain why the JSDF was out in force," Kukai commented. Everyone looked at him. "What, you didn't notice? There were soldiers everywhere, and vehicles. I'm not sure what they're planning to do against the end of the world, but…" He shivered visibly, and she saw Yaya squeeze his hand.
Ikuto spoke up. "It isn't your fault, Amu. You're doing your best, right?"
She hesitantly nodded.
He shrugged. "Then I don't see a problem. I don't think we could hold it against you even if you didn't, but -" His eyes narrowed "- why are you involved at all? If it's got something to do with the humpty lock, I'll do it instead."
"It's not…" She trailed off. Ikuto had been glancing at Mom frequently. Something was going on there, and she wasn't sure she liked it, but she guessed Mom hadn't told him anything important. She didn't want to explain her exaltation right now. "…It's something only I can do," she decided. "Miki's helping a lot, but that's because she's Miki, not because she's a chara." And she didn't want to explain their new relationship either, not right away.
After the Conception, then, and hopefully she wasn't putting it off until after their death.
Amu wilted a little, thinking about what might happen.
Yaya looked at her, frowned for a moment, then perked up. "Oh, but Amu's not here to get interrogated!" She chimed in. "That's our job, Amu's the one with the interrogators. Did I tell you she has henchmen now?"
There was a pause.
"What? No, I said!" Amu complained.
"Oh, so that's what it was." Tadase nodded wisely. "I was wondering where she got them, but she's just taking Complete Annihilation to the next level. You didn't have to, Amu, really."
Horrified, sensing an incomprehensible betrayal, she turned to stare at him.
"That's right," Yaya agreed. "Amu's always so
serious about things."
Kukai let out a chuckle. She shot him an accusing look. Everyone… everyone was failing her. Everyone, except… "Nadeshiko?" She tried, looking at the only one of her friends who hadn't spoken up yet. "You don't think they're my minions, do you?"
"Not minions," Nadeshiko agreed quietly. Amu nodded approvingly, then froze as she continued. "Henchmen."
Yaya giggled.
Amu glared at the girl who'd taken everything from her. The bane of her existence, the… oh, never mind. "Yaya, this is all your fault!" She yelled as she launched herself at her friend, tackling her to the floor and tickling her until she was laughing hysterically. Kukai shortly joined in, trying to save Yaya, Tadase attempted to intercept Kukai - but ended up another victim of Amu, who'd forgotten to be embarrassed after a giggling Ran forced a character change on her - and the meeting generally dissolved into a laughing tangle of limbs.
———
"Oh, I needed that," she giggled, leaning against Yaya's back. She also probably needed a shower, they were both sweaty and she hadn't even changed her clothes since yesterday, but she'd worry about that later.
"Glad to have helped," Yaya hummed. "You know, I never asked… no, never mind. Don't worry about it, I won't."
Worry about
what, Amu wondered. If she didn't want her to ask, though…
She shook her head, looked at her watch, and got to her feet. 12:40. "All right. We'll talk later, okay? I'm almost out of time, and there's something I need to ask Ikuto about. Utau, too. Speaking of which, have you seen that brother of Utau's I heard about?"
Yaya giggled, giving her a speculative look. "Noo~, I think it's best if you ask Ikuto about him. I don't want to ruin the surprise."
Amu looked blankly at her. "Surprise? No, never mind, I'm really running out of time here. Thanks, Yaya!" She gave her an impulsive hug, then looked around for Ikuto. There he was, sitting next to Utau in a corner. Convenient. Well, not precisely "next to", it looked like she was…
———
"No, I said." Ikuto sounded frustrated. Amu had only caught the tail end of the conversation, but apparently he wasn't so much "sitting in a corner" as "cornered". What was Utau doing?
"But Ikutooo!"
Ikuto met her gaze, and she drew the corner of her mouth up in a half-smile.
"Ikuto? Who's…"
She poked the fastening of one of Utau's ponytails. The idol shrieked, then turned and looked up at her. "Oh, it's you. Amu, wasn't it?" Utau sighed, and slowly continued. "I'm not going to apologize for anything, but… thank you, I suppose. Your parents did tell us why we're here. Not the others, they're too young, but I wouldn't want to risk it out there. I do appreciate not needing to."
Utau narrowed her eyes. "Ikuto's still mine, though. Do you understand?"
Amu looked at her in confusion. Still hers? Did that mean -
"Oh God, I so did not need this," Ikuto groaned. "Amu, please let me introduce you. This is Tsukiyomi Utau." He paused, and her eyes widened in realisation. "My blood-related younger sister. It'd good if both of you remembered that. Utau, this is Amu, -" He paused, dramatically "- my adoptive little sister. Get along, will you?"
His
what?
"Your
what?"
Amu stared at him in total, genuine incomprehension. She was joined in that by Utau, who'd actually shouted the question. Ikuto smiled at them with some amount of glee.
"Well, you see. I was talking to your mother, Amu-
chan, and she brought up an interesting detail. Apparently chara users have a much better chance of survival, even if you don't completely succeed. Therefore, since we already know each other - and because I'm the oldest one here -" He smirked, holding up a signed contract. "Welcome to the family, Tsukiyomi Amu. I'll do my best to be a wonderful
brother."
The room had gone completely quiet. Amu looked around desperately, but it seemed Dad had bundled everyone out of the room before that conversation - Mom was still there, but she just nodded.
Letting him meet Mom had been
totally, utterly the wrong idea!
She found her gaze inevitably, magnetically attracted back to Ikuto.
"Of course, you're still on the Hinamori family register as well. It's a bit unusual, and maybe not strictly speaking legal, but for the time being you can use both names. Doesn't that sound great?"
"I…" She tried saying something, but found her voice wouldn't come out. This was
completely unfair! Utau was still staring at them. Utau… "Utau, are you going to accept this?" She asked.
Utau looked between her and Ikuto a few times, then slowly started to smile. She reached out to ruffle her hair; Amu was still too shocked to stop her. "Well, why not? I'm sure you'll be a
great younger sister, Imouto-chan. I always wanted one, you know. Besides… less competition." Competition? What was she talking about?
Ikuto looked a little uncomfortable, but eventually shrugged in resignation. "We'll talk about that later. Amu, I'm sorry to drop this on you right now, but it was important to explain before - anything happened. That being said, did you want something?"
Amu blinked. Yes, she did, and she was getting really short on time; there was no time to worry about all of this right now. That seemed to be becoming a disturbingly common trend, unfortunately. "Oh, right! Yes, I wanted to ask if I can borrow the Humpty Key. And also… Utau, you know if it helps or not, right? I mean, with character transformations? Without spending a lot of time getting used to it?"
Utau looked uncertainly at her. "It does, but…"
Ikuto got straight to the point. "What are you planning? You can already do transformations with the lock, right?"
"Trust me?"
They didn't, and so she found herself having to make rapid explanations of what she wanted to try. Convincing them took too much time, so Ikuto eventually joined her in the elevator - and so did Utau, insisting on it since Ikuto was coming.
Getting him to agree that her hare-brained idea was a good idea at all took a lot of fast talking, and in the end she wasn't sure herself. Utau, surprisingly, supported her; as she said, sometimes it was best to risk it all on a throw of the dice and hope for the best.