Author's notes

Hi readers, welcome to my fanfiction about FGO and Blue Archive crossover!Side storiesare my side projects that focus on daily is exclusive, new content separate from the main story yet canon in this fanfiction.Side stories happened between the main stories without spoiling this fiction's plots. This side story takes place after Hyakkaryouran Chapter 1 (The main story has yet to catch up to that.)

(I can't be writing the main story solely all the time, that thing was really exhausting. It requires too much brain power.)

ENJOY!

Fate/Grand Order: Where All Miracles Begin, SCHALE

Side Story: Game Development Department and The Hero Party (2/3)

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"Yep. You're coming with me to Millennium as a surprise guest for the club." I said smilingly.

"Wow, for real?" Charlemagne's face lit up, his excitement already bubbling to the surface.

"Yep, but..." I raised a finger. With his brimming face, I kind of knew what he expected. "We can't have you walking around Millennium Academy in full armor and a cape. It'll cause a scene."

Charlemagne blinked, visibly disappointed. "What? No grand entrance in my resplendent armor? No cape billowing majestically behind me?"

I sighed, rubbing the back of his head. "Yeah, no. As much as I love your flair for the dramatic, Millennium's students might think we're under attack if a knight suddenly storms in."

Wait— Maybe I need to take back my words. It wasn't like the Millenium was always peaceful right? On any normal day, there were always student causing trouble with their inventions.

Maybe just one more knight won't hurt—?

I shook the thought away as someone's face instantly appeared in my mind.

'Sen...sei!'

My ears surely weren't ready for an hour of nagging.

I'm sorry, Charlie... I didn't want to risk myself. It was also better to cause any more trouble for the Seminar.

"Hmmm, fine." The young adventurer said, crossing his arms but already perking up at the thought of the surprise. "So Master, what's the plan then?"

"We go in casual clothes," I explained. "I'll enter first, just to set the stage. Once I give the signal,thenyou come in. But that's when you'll switch to your full knightly getup. The reveal will blow their minds.

Charlemagne clapped his hands together, his excitement returning in full force. "Brilliant! That'd be so cool!"

"Cool right?!" Imagining their faces made me happy already. "Alright, let's get ready. This is going to be fun."

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"..."

Hey, look at him, Why is he standing still?

Isn't he a bit different today?

In the middle of Millennium Academy's bustling courtyard stood a young man,alone, his arms crossed— his knightly demeanor completely out of place amidst the futuristic surroundings. Students zipped by on hoverboards, drones carried supplies overhead, and a faint hum of machines and devices filled the air.

"Where... am I now?" Charlemagne muttered, his blue eyes scanning the campus with a mix of awe and confusion. "This doesn't look anything like Chaldea... or even a battlefield..."

He glanced down at the small name tag pinned to his jacket that read"OFFICIAL – SCHALE — Fujimaru Ritsuka"in neat letters, followed by a credit card tucked in his pocket. The items only reminded him of the unexpected circumstances that had brought him here.

As for what happened?

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A few minutes earlier, the two of them had been driving toward Millennium, chatting and finalizing their plan. That was until Ritsuka's phone vibrated with an urgent notification.

Ritsuka glanced at the screen. His expression immediately shifted from relaxed to tense. "It's Kikyou... she's my student from another school. She says it's serious."

Charlemagne raised an eyebrow. "Serious? Like, Grand Order-level serious?"

"I don't know the details..." The man admitted, stress evident in his voice. "But if Kikyou is messaging me with the word 'serious,' it's probablyverybad."

The one who messaged him was Kiryuu Kikyou from Hyakkiyako, the most serious member of Hyakkarouran Conflict Resolution Council. Most of the time, their chat was only work-related yet he rarely saw the word 'serious' from her.

"..." Ritsuka gulped a dry saliva. Recently, there was an incident with the school too.

Seeing his master's face, Charlemagne leaned back, thinking for a moment. "Hey, Master, then what about the Game Development Department? You can't just ignore her, right?"

Ritsuka frowned and exhaled a long sigh. "This is bad timing..."

"Shall we postpone the game development Department?" Charlemagne suggested, offering the easiest method.

Ritsuka was lost in thoughts for a moment and shook his head. "Hmmm... Just as we finished our talk, I already texted them I'd be there with a huge surprise."

"..." The young king now understood his trouble, breaking a promise was surely something uncool he'd try to avoid too.

"..."

"..."

"Charlie."

"Yeah? What is it, master?"

"Can I leave the girls to you? Just hang out with them, play games, chat— all that babysitting stuff." Ritsuka grinned mischievously "You're a prince charming. They are very good children too, you'll be fine."

Charlemagne's eyes widened slightly "Well... you don't need the latter part, just say the word and I'll do it."

Beaming a radiant smile, the teacher was assured his students would be in good hands. He couldn't imagine anyone who wouldn't like Charlemagne— Friendly and bright, warm but cool at the same time.

Ritsuka chuckled. "Exactly. Here, take this."

"It's a my name tag and a secondary credit card. Just in case."

"Oh, and the directions to the clubroom are pretty simple—"

"Left, go 2 blocks straight, hop on the 3rdplatform, left, after you see a weird curvy building, go right, enter the 2ndbuilding, and then up to the third floor."

"Got it?"

Charlie stared blankly at him.

"... Sure."

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Back to the Present, that was what happened.

Now, standing in the middle of Millennium, the Father of Europe scratched his head and pulled out the small note Ritsuka had scribbled directions on. He frowned as he turned the paper sideways, trying to make sense of the cryptic maze his master had described.

"Left, straight, left... or was it left, straight, right?" he muttered.

A group of students passed by, glancing curiously at the tall, handsome man who seemed very out of place. Charlemagne, oblivious to their stares, stuffed the note back in his pocket and tried to regain his composure.

"Alright, Charlie..." he said to himself, straightening up and nodding confidently. "You're a king, a knight, and an adventurer. How hard can finding one little clubroom be?"

With a resigned sigh, he muttered. "Master, you really left me in the thick of it this time, didn't you?"

As the man wandered aimlessly, students began to take notice of the tall, charismatic figure. At first, it was just a few curious glances. Then, whispers began to ripple through the air, spreading faster than he realized.

Wait, is that Sensei?a girl in the distance whispered, her voice tinged with excitement.

It has to be him! Look at his face!her friend replied, clutching her tablet.

But his hair...another chimed in, squinting at him.Did he... dye it? That white streak makes him look so trendy!— like a rebellious teen!

Charlemagne caught snippets of the conversation, his ears perking up at the sound of 'Sensei'. He stopped in his tracks, glancing around to see a small group of students now gathering nearby. Their excited murmurs grew louder.

"Wait a sec..." The man muttered under his breath. "They think I'm...him?"

More students began to gather, pointing and gossiping with an almost synchronized giddiness.

Doesn't he look like a prince from a fantasy novel? That white hair pulled all my heartstrings

He's glowing! Look at that aura! It almost blinded me!"

Charlie's face froze for a moment as he processed their chatter.Glowing? Aura? Really?He fought the urge to laugh with his life. The crowd grew larger, their voices blending into an excited cacophony.

"Ladies, ladies,..." he began, holding up his hands in a calming gesture, his charming smile still plastered on his face. Right now, he had to complete an honorable mission, it was time to ask for direction. "I appreciate the enthusiasm, by the way—"

"Sensei! Are you here to supervise the festival?"

"Sensei, your new look is amazing!"

"Sensei, over here!"

Charlemagne froze as the overwhelming attention hit him like a tidal wave. He had walked into a trap of his own making, though he had to admit—he didn't entirely mind the admiration. Still, this misunderstanding was getting out of hand. A bead of sweat on his temple.

Master, where are you when I need you?!

And what have you done over here?! So, the rumor that you're sinful is true?!

Now he saw why female Chaldea servants seemed to step up their games lately...

"Fair maidens... Do you happen to know where— "

"Kyaaa! Sensei why did you change your speech?!"

"Sensei, are you actually a prince? I knew it, I knew you really are!"Another student blushed.

"I can die in peace now..."One more fell backward to the floor.

"Wait! Hang on—" It failed, just as he was about to give it another try, his voice caught in his throat as the sea of students parted. A single figure emerged from the throng, walking toward him with purposeful steps.

It was Hayase Yuuka.

Her sharp eyes locked onto him. There was something unreadable in her expression—a mix of confusion, irritation, and that telltale air of someone ready to lecture.

The murmurs around him intensified.

Uh-oh... It's Hayase-san.

Sensei's in for it now.

Will he survive the treasurer?

The man blinked, unsure why the students suddenly seemed to pity him, but before he could say a word, the twin-tailed girl reached him, standing toe-to-toe.

"Seeeen...Sei!, What is this?" she asked flatly, gesturing toward the crowd. "What kind of ruckus are you trying to create, Sensei?"

"Ah, you see—" Charlemagne began, but Yuuka wasn't finished.

"And what's with thislook?" she cut in, her eyes narrowing as she pointed at his outfit. "What are you even wearing? That jacket—it's not a suit, is it? It doesn't even match your usual style!"

He opened his mouth, waiting for a pause, but Yuuka powered through like a freight train.

"Where's your necktie? Did you forget how to dress yourself? And don't get me started on your hair! Since when did you think looking like a rebellious delinquent was a good idea?"

"Miss, I think—"

"Are you trying to give the students a bad example? Honestly, what's wrong with you today, Sensei?!"

The crowd snickered and whispered among themselves.

Oh no, Yuuka's in full nag mode.

Poor Sensei... He looks like he doesn't know what hit him.

Think he'll make it out alive?... I can't let her see me, or else she'll cut my budget!

Charlie stood frozen, his knightly demeanor slipping as Yuuka's rapid-fire questions and criticisms left him scrambling for an opening. His lips twitched, desperately trying to form a response, but her unrelenting critique left no room to interject.

Finally, Charlie raised his hands in surrender, his voice cutting through the chatter. "Wait! Please, just a moment!"

Yuuka blinked, her tirade pausing for a split second.

"I'mnotyour Sensei..." The man said, smiling nervously as he gestured toward himself.

"My name is Charlemagne. I'm a guest, and—if you'd allow me to finish... I'm also completely lost."

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"..."

Yuuka stared at him, processing his words. Her piercing gaze shifted to the crowd, then back to Charlie.

"..."

"(o_o;!)" Charlemagne's bright grin faltered as Yuuka crossed her arms, her skeptical glare boring into him.

"You're telling me," she began, her voice dripping with suspicion, "that you'renotSensei? What kind of prank is this?"

"Prank?" Charlie blinked, bewildered. "No, no, I assure you—"

"Your hair, your height, and your face..." she paused, leaning closer as though to inspect him more thoroughly.

The man was also built the same as Ritsuka, the same height and physique. His lean yet refined muscles made the young man look like an athlete instead of a bodybuilder. White shirt, black casual pants, and a black casual jacket... she were all familiar with them.

Because they were Ritsuka's.

Those were the clothes he lent to Charlemagne when they came to Kivotos. Yuuka, as one of his closest students, had spent uncountable time with him— she also helped with bills, clothing bills included.

She knew his items in the closet and fashion sense like the back of her hand...

In addition, the name tag on his neck displayed 'Fujimaru Ritsuka'.

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"Sensei... Don't think you can fool me with some weird delinquent act."

Charlie opened his mouth to protest, but Yuuka's unimpressed look shut him down before he could get a word in edgewise.

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A little further back in the crowd, a girl stood with her arms folded, watching the scene unfold with a bemused smile.

"That's Yuuka-chan... and Sensei?" Ushio Noa murmured to herself, her amethyst eyes narrowing as she focused on the man standing before Yuuka.

The resemblance was uncanny, but something about him seemed just slightly off. His posture was a little too confident, his smile a little too self-assured, and his voice carried a playful undertone that the real Sensei rarely used.

As the Seminar's secretary, she paid attention to details in everything— her teacher included of course. Not only memorized, Ritsuka's actions and behaviors were noted in records too. Nothing odd could have gone pass this woman's eyes.

"No..." Noa muttered, a sly grin creeping onto her face as realization struck. "That's not him."

She chuckled quietly to herself, deciding not to intervene. Watching Yuuka squabble with this 'Sensei imposter' was far too entertaining to interrupt.

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Eventually, Charlie sighed, running a hand through his hair. "Little girl, I'm not Ritsuka. My name is Charlemagne, and I'm a guest here."

Yuuka raised an eyebrow, clearly unconvinced. "Charlemagne, huh? You're still pulling this act? Fine, whatever you say." She waved her hand dismissively. "If you're not Sensei, then what exactly are you doing here?"

Hayase Yuuka groaned under her breath, thinking the 'Charlemagne' must be his new game alias or something.

"I'm here to hang out and play games with the Game Development Department girls." Answered confidently, the man also straightened up as his knightly pride kicked in.

Yuuka froze, her eyes narrowing as his words sank in.

"TheGame Development Department?"

"Yes." Charlie said cheerfully.

Yuuka's expression darkened. "You mean to tell me they'replaying games?Not developing them?"

"Uh... I suppose?" Charlie replied hesitantly, sensing a shift in her demeanor. Did not he know, he stepped on a landmine— He was already dead.

Yuuka stomped her feet cutely in frustration. "That club issupposedto be creating games! Do you know what they've accomplished this semester?"

"Uh... no?" Charlie said cautiously.

"Nothing!" Yuuka snapped. "I was just about to cut their funding for wasting school resources. If they have time to play games, they have time to actually work!"

The crowd of students murmured nervously at Yuuka's fiery outburst, while Noa quietly chuckled to herself in the background.

Yuuka turned sharply to Charlemagne, her expression set. "I'm going with you."

"With me?" Charlie asked, blinking in surprise.

"Yes." she said firmly. "I need to see for myself what kind of nonsense they're up to. Let's go."

In the end, both walked off together.

The young knight let out a relieved smile, not that he could finally get to the club... but the nagging ended.

Meanwhile, Noa lingered in the back, smiling knowingly.

"Fufu... This just got even more interesting."

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In front of the Game Development Department's door, a man found himself standing alone. The echoes of his footsteps fading into the hallway behind him.

For a moment, he stood there, straightening his casual jacket. Yuuka had left just a few minutes earlier, summoned to another errand that demanded her immediate attention. She'd barely paused before briskly excusing herself, leaving him with a stern 'don't cause any trouble, I'll be back!' before striding off.

The walk they'd shared through Millennium's bustling campus was... intriguing, to say the least. Charlemagne wasn't entirely sure if their exchange qualified as a conversation or an extended monologue. Yuuka had done most of the talking, recounting her day in meticulous detail—her thoughts on the students she oversaw, the mountain of work piling up on her desk, and the challenges of being Millennium's treasurer.

The young king had nodded along, occasionally offering a polite 'I see' or 'That does sound challenging'. He wasn't sure if she even noticed his responses— she seemed perfectly content to speak her mind.

But as she talked, he noticed something: her unwavering trust in his master.

Hearing that, Charlie couldn't help but smile.Of course they trust him. He's my Master, after all.

At the same time, a quiet thought lingered in his mind, amusing him to no end.

Another world, another harem.

Now, as he stood before the club's door, Charlemagne felt a flicker of anticipation. Ritsuka had already briefed him who the girls were— the man remembered their faces and descriptions with no trouble.

"This is it," he muttered to himself. He knocked once, twice, and then pushed the door open.

The chatter inside came to an abrupt halt as the girls turned to face the unexpected visitor.

"Sensei! You're here!" Aris exclaimed, her voice bright and excited.

"Hi, little girls!" Charlemagne said, beaming with a smile.

"Eh? Sensei! You've changed a lot!Is this your new skin?!" Noticing a huge difference from the usual appearance, Aris was surprised, her eyes sparkled with stars.

"Uh— Haha, well... Actually, I'm not your —"

"Whooa— Sensei! You look so cool today!"

"Yeah! Is this, like, your secret edgy look?!" Momoi shouted, practically bouncing in place. Midori also added, her twin ponytails bobbing as she leaned forward with excitement.

"It suits him..." In the back of the room, Yuzu—who had been quietly observing—muttered in her usual soft-spoken tone.

Charlemagne scratched the back of his head, his jacket shifting slightly as he adjusted his posture. Since the original plan had fallen through—where Ritsuka would introduce him as a knight in shining armor—he decided it was better not to create more of a stir by revealing his true identity in full regalia.

I guess today, I'll just stay in the room, play some games, and wait for Master to return...The young man thought to himself.

"Well— Ahem, Ahem." Clearing his throat, he continued. "Allow me to introduce myself properly. My name is Charlemagne, but you can call me Charlie or Charles."

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The room fell silent, the girls staring at him with blank expressions. For a moment, Charlie thought they were finally starting to believe that he wasn't their Sensei.

Then, out of nowhere, Aris's face lit up, and she clapped her hands together.

"Okay!" she exclaimed, her voice brimming with excitement.

"...Okay?" The man repeated, blinking in confusion.

"Yes, Sensei!" Momoi chimed in, nodding eagerly. "That's such a cool alias! 'Charlemagne' sounds like a knight straight out of a fantasy game!"

Midori grinned. "Using the name 'Sensei' all the time must be boring, huh? Switching to an alias is totally normal in RPGs!"

"So today, we'll call you Charles-sensei!" Aris declared with a triumphant smile.

Charlemagne's mouth opened, then closed as he processed their reaction.

"Wait— You think I'm roleplaying?"

"Of course!" Aris replied, completely missing his confusion. "It's perfect! You're nailing the 'mysterious knight with a secret identity' vibe!"

Yuzu, still standing in the back, quietly nodded. "It's fitting." she murmured.

Charlie sighed internally, a mix of amusement and exasperation bubbling within him. Even though lying was taboo in the chivalry code, this little misunderstanding was for the sake of 'coolness' right? As long as the girls were happy, he didn't care about his real identity in the slightest.

I see... They're still convinced I'm their Sensei. Master, you owe me for this.

"Well then..." He said, resigning himself to the misunderstanding but keeping his smile intact. "If that's what you want to call me, Charles-sensei it is."

"Oh! Sensei, and what is the 'surprise' you told us?"

"Uhmm..." Charlemagne scratched his cheek, using all his wits to avoid disappointing the hopeful girls. "It's not the time yet, it'll come later."

Well, I'm supposed to be the surprise...Nervously thought to himself, he smiled dryly.

"Yay, We're looking forward to that! Come in, Sensei! Let's play games!"

The girls cheered, immediately pulling him toward the game setup, eager to show him their updated game library. Charlemagne chuckled, letting himself get swept up in their enthusiasm.

At least this will be fun.

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Time flew.

Three hours had passed in the blink of an eye.

The once-quiet Game Development clubroom was now filled with cheerful laughter, shouts of triumph, and the occasional groan of defeat.

"Ha! I win again!" Charlemagne exclaimed, leaning back with a triumphant grin.

"Ugh, Sensei—uh, I mean, Charles-sensei, you're way too good at this!" Aris pouted, crossing her arms as her character fell for the third time in a row.

Midori groaned. "Seriously! Where did you even learn to play like that?"

"It's a secret!" Charlemagne said with a playful smirk, brushing imaginary dust off his shoulder. "Let's just say I grinded a lot in the scariest dungeon."

Saying proudly, the man had every right to boast. In fact, he honed his skills in the renowned Chaldea recreation room. Since It's a matter of pride, he couldn't afford to lose to the other kings and heroes. After all, he represented France... as the King of Franks, he wouldn't bring shame to his people.

The girls groaned in unison as Charles laughed, his infectious energy filling the room.

Just as the sun began to dip lower in the sky, casting a golden glow through the windows, a sharp knock at the door interrupted their fun.

The door creaked open, revealing two familiar figures: Hayase Yuuka and Ushio Noa.

"Ehhh— Yuuka?!"

"The devil is here..." Unlike the surprised Aris, the twins trembled in fear.

Yuuka stepped in first, her piercing gaze scanning the room, while Noa followed behind, her expression calm and mildly amused.

"Sensei... What are you doing here?"" Yuuka's eyes locked onto Charles, her brow furrowing yet her mouth curled into a devilish smile... as though catching a criminal red-handed.

"Uh—"

"He's been playing with us!" Charlemagne began, but Aris cut him off, jumping to his defense innocently. Without knowing— it was the worst thing to say. Now, the evil treasurer knew the teacher did not 'guide' them to properly perform their club duties but played games.

"Playing with you, huh? –Exactlywhat I wanted to talk about."

The atmosphere in the room shifted as Yuuka crossed her arms, her stern gaze falling on the Game Development Department members. Noa at the back stayed quiet, only smiling with amusement.

"The Game Development Department's performance this semester has been... underwhelming,"

"You've produced nothing. No progress. No prototypes. Nothing at all. And you're using school funds to sit around and play games? If this keeps up, I'll have no choice but to cut your budget entirely."

Aris and the others exchanged worried glances.

"Wait!" Momoi protested. "It's not that we don't want to make something! We just... lack inspiration lately."

Yuuka raised an eyebrow. "Lack inspiration?"

"Yeah!" Midori chimed in. "We've been brainstorming, but nothing feels right. We're struck!"

"We've decided to go with an RPG game instead of a sports game but..."

Sighhhh...Yuuka let out a long sigh, pinching the bridge of her nose. "Then here's a thought: go outside. Get motivated, get inspired by the world around you. Dosomething."

"If you can't produce any results by the end of the semester, your club will be shut down."

"Lastly, I need to see any tangible progress, whether they are concepts, scripts, or plots— Submit it to me by this week."

Noa, the secretary who had been silently observing, finally spoke up, her voice soft but teasing. "You know, Yuuka-chan, you've turned on your nag mode again."

Yuuka's cheeks flushed slightly. "I'm just doing my job."

"A—Anyway! Come to the Student Council room if anything. I'll be seeing you."

And the two of them left.

As though recovering from shock after the storm dissipated, the room fell silent for a while.

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"That was... intense" Midori mumbled, sinking back into the couch.

"Yeah..." Momoi agreed, her shoulders slumping. To think that they were back to this situation again in just a few months. Yuzu also quietly came out from the locker.

"Sensei... is this the 'surprise' you prepared for us?"

All eyes turned to Charles, who stood awkwardly near the center of the room, shaking his head emphatically. "Of course not! Absolutely not this one!"

Amidst the sour mood, a girl stood up.

"Everyone! Let's go on an adventure!" With her eyes sparkling brightly, Aris declared— brimming with excitement.

"Adventure? Like... a field trip?" Momoi asked, tilting her head.

Hearing that, Aris grinned.

"Huhu... No, no, no— An RPG adventure! We're making an RPG game, right? What better way to get inspiration than to experience a real adventure ourselves?"

Charlemagne's ears perked up, adventurer was his occupation after all.

"But where do we go?" The older twin asked.

Aris leaned— the grin hadn't left her face, lowering her voice for dramatic effect. "Have you heard about the ghost rumors?"

"Ghost rumors?" Charlemagne repeated, his brows furrowing.

"Yes!" Aris responded, her enthusiasm growing. "They say ghost monsters have been spotted in the mountains behind Hyakkiyako Academy. Glowing eyes, eerie howls, strange shadows moving at night—it's got all the makings of a real adventure!"

The young adventurer blinked, trying to process what he'd just heard. "Ghost monsters? In the mountains?" He let out a small chuckle. "That sounds like a story someone made up to scare kids."

"It's not just a story!" Aris protested. "People have seen them! Right, Momoi? Midori?"

Momoi and Midori exchanged hesitant looks before nodding.

"We've heard about it too." Momoi admitted.

"Yeah." Midori added. "People say it's been happening for weeks— the rumor just surfaced again yesterday."

"Hmmm...?" Charlemagne leaned back, stroking his chin thoughtfully.

In truth, he wasn't too worried. His Master had never mentioned this world being particularly dangerous—aside from the occasional student brawls that bizarrely involved military-grade weapons. If there were truly something dangerous lurking in the mountains, surely his Master would have said something— Wouldn't he?

Clap! Breaking him from his thoughts, Aris clapped her hands together.

"Yay! It's settled! We'll head to the mountain and solve the mystery!"

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"The Hero Party..."

"Journey— Start!"

As the sun began to dip lower in the sky, casting a warm amber glow over Millennium Academy. The Game Development Department set out on their adventure.

Unaware of the trials and revelations that awaited them.

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END.

Author's notes

The chapter is sooooo long! But it's worth it for the build-up!

Hope you enjoy Charles's role here. I just can't help it with him and gudao literally have the same face. It's also very refreshing to have Charles as a main character (He also tasted Yuuka's welcome nagging, welcome to Millennium!)

If you're wondering— No, Charles doesn't know that Ritsuka went to where. He only knows his master mentioned the name Kikyou.

What will happen to him? What will happen during the adventure? Stay tuned for the next chapter!

Again, this side story happened after the Hyakkaryouran (Vol.5 chap 1)