Prologue

Year : 2056

Two years after the delivery of the vibration warhead, America sustained communication with every state. The production of the vibration warhead was implemented by the American government against the Fleet of Fog.

Year : 2058

The U.N. government was formed and established a fleet to hunt down the notorious swindler, traitor, and extortionist Chihaya Shouzou, the leader of the 'Scarlet Fleet' and the 'Scapa Flow Fleet.' However, the fleet was put on stand-by when Chihaya Gunzou, son of Chihaya Shouzou, made a proposal to capture the his father with his own power and resources. The U.N., because of his recognition as a world hero, granted his request.

Later that year, the Japanese Government and the Fleet of Fog's Oriental Fleet had formed an alliance in order to strengthen their power to capture the notorious leader of the Scarlet Fleet. The Oriental Fleet was composed of Kongou, Kirishima, Haruna, Takao, Hyuuga, and the menta-modeless Maya, and the famous I-401 submarine, and together they searched the whole of the Pacific for the Scarlet Fleet.

Year : 2059

After a year of searching, they found the Scarlet Fleet. The Blue Steel Fleet, together with part of the U.N. Navy Fleet, engaged in battle.

The Scarlet Fleet and Scapa Flow Fleet, composed of the Battleships Yamato, Musashi, and the Bismarck; the Submarine U-2501 and its fleet; and many Fleet of Fog ships, were destroyed. All of the crew members except the Yamato and Bismarck were executed on the spot by I-401's super-gravity cannon.

Musashi, commanded by Shouzou Chihaya at the time, was sunk by the Oriental Fleet's flagship Kongou and I-401. Yamato and Bismarck fled the battleground and disappeared.

Later that year, a satellite was launched from Houston and orbited at the Earth's atmosphere. It acts as a long-distance communication link, which connects the two supreme countries, United States and Japan.

Since then only a small number of Fleet of Fog remained attacked or intercepted civilian ships or airplanes.

Year : 2060 P.T. (Peace time)

Location : Pacific Ocean, near Japan

The Pacific Ocean swayed at a calm pace. The early night sky began to envelope and turn the ocean's color into a navy blue. The air was smooth and created a low, humming sound as it made contact with the water.

The cruise ship Princess of the Moon glided across the surface of the ocean. It was the first cruise ship made in years, and was allowed by the International Oceanic Transportation Committee to sail in the Pacific, bound for Japan.

The bow deck was filled with passengers who were dancing with the sweet mellow music coming from the ship's speakers. There were also children playing on the deck, on the farther side of the ship, enjoying the calm speed of their transportation vessel.

In the bridge, the crew of the ship were also enjoying the night with wine and food. Right now they were allowed to have fun since it was Christmas Day. However, the fun was interrupted when they heard a beeping sound coming from their radar.

"Hmm, what's this?" a crew member said as he looked at the screen. A small red blip lay behind their marker for the ship.

"A whale maybe?" another crew member said, however the dot disappeared and reappeared several seconds later, this time beside their ship.

"What on earth is this?"

"Could be Fleet of Fog?"

"No it's too fast for a battleship or fast cruisers."

The crew gathered by the radar monitor, disturbed by the dot, which was still moving and approaching them speedily.

"Bearing 9'o'clock. Speed…30…no…40…50-"

"Oi, it's increasing!" a crewmember said and ran to the window of the bridge, taking out his binoculars to look at whatever was approaching them. "What the-! Turn around! Hard to port!" he shouted, but it was too late. Not even a second afterwards, the whole ship rocked left and many passengers, still outside, were either thrown over-board or slumped on the wooden deck.

The Princess of the Moon, earlier filled with dancing music and a Christmas atmosphere, was split in half and burning on the surface of the water.

The ship sank slowly under the cold, heartless Pacific, ripples and waves dancing upon its surface as the night sky was filled with screams and terror from remaining passengers squirming and struggling in the ocean water.

But their agonizing and desperate sounds were immediately cut after a flash of gold colored light suddenly came out from the smoke of the burning ship and hit them.

Stalking in the distance, surveying its feat in the coldest glow of the fire, was the predatory vessel. It was an 18th-century model, a fourth-rate with its sails fluttering and tugging the ship away, but as the ship moved further into the deepest waters it began to glow in blue and gold colors. Its name shone on the stern in mockingly brighter hues as it swerved into the darkness, gloating that the ship was the Jackdaw.

Kamikage Ryuujirou leaned his back on the chair, talking on the phone with caution. His thoughts were still clear and sharp even though it was already midnight, and, even though the tone of his voice was calm, its content was case-sensitive and could jeopardize his position in the government. The topic was gruesome.

"I understand, Prime Minister. As of a moment ago, I sent a patrol unit to the last course and position of the Princess of the Moon before their communication died."

He fixed his glasses and mellowed his hair passively as the British prime minister spoke on into his ear.

"We also asked the American Base in San Diego to help us in the operation…but their communication went dead too-"

The prime minister said something on the other end of the line, causing Ryuujirou to sigh.

"I'm afraid so, sir. I'm forming the same possibility," he paused and fixed a tie on his casual shirt, "that the San Diego naval base was attacked."

He moved the mouse of his computer and clicked.

"In this course of action…we already called them," he said with a smile. "Yes, the Blue Steel Fleet."

Chihaya Gunzo, a dark-haired man, slowly opened his eyes and looked at the large screen hanging above the control center of his submarine, I-401. He looked around and observed each of his crew, who were in a happy mood, even though it was already past Christmas Day.

His eyes scanned to his sonar operator and communications officer Shizuka Hodzumi, a girl with long black hair, spectacles over her gray eyes, and a violet skirt with a tucked-in white top, then to his weapon master, Kashihara Kyouhei, a tanned man with a pair of goggles over his green eyes whose upswept hair was tied into three ponytails, wearing a Sando shirt and brown cargo pants. Both were humming a Christmas children song cheerfully as if it was still Christmas.

"Captain, we're entering Japanese territory."

He looked at his first mate, Oribe Sou, and nodded. Sou was, as usual, sporting a sweater and blue jeans, and the same red and white face mask enwrapping his whole head still was his most prominent quality.

"Gunzo, are you all right?"

Gunzo looked at Iona, a small girl with green eyes and tinted white hair who wore a navy-blue school uniform. She was the mental model of his submarine, I-401, sitting on an elevated podium in between Sou and him.

"Yeah…I'm fine…" Gunzo said calmly.

"Is it because you're wearing a t-shirt instead of you usual one?"

"No, it's just that it's…Christmas time."

Iona blinked her eyes and said.

"Christmas is one of the events that humans love to celebrate with their love ones right?" the girl asked as Gunzo closed his eyes and nodded.

Iona stared at him for a moment then she remembered their mission involving U.N. a Year ago, she looked away and in awkward voice she said.

"Sorry Gunzo…"

Gunzo looked at her, confused by what she said until he realized that the girl remembered.

"It's all right Iona; I'm past all of the stages of grief." He smiled at the girl, and she smiled back.

"Captain, engine reporting." The screen above them suddenly changed and showed a girl with orange hair tied into twin pig tails.

"I've finished repairing some parts; as usual we're running out of nanomaterials."

"Very good then, Iori."

Iori Watanuki, the engine operator, smiled peppily.

"Yes, sir," she replied, afterwards disappeared from the screen as the voyage continued to Japan. Gunzo, the young submarine captain, and his crew were returning from their mission, which was the investigation about dead communication in San Diego Naval Base…and the result isn't good.

"The naval base was completely destroyed…" he whispered to Iona as they stared at the screen.

"Gunzo, there're traces of oceanic and geographic disturbance on the base"-she paused to looked at him-"an indication that a Super Graviton Cannon was fired there."

The captain closed his eyes and thought of the many battleships that he and his crew had sunk which used the same weapon against them. None of them matched the strength of what destroyed the base.

The range is too wide for a Super Graviton Cannon…

He pondered deeply over the weapon and the scale of the destruction before his thoughts were interrupted by Shizuka.

"Captain, receiving incoming call from our Headquarters," she said as the captain nodded. Upon his notification, she pressed a button on her console, allowing the call to come through.

The large screen above the control center opened a new window and stirred to life.

"Captain, this is Hyuuga, reporting for duty," A brunette with a monocle on her right eye and wearing an orange sweater, grey miniskirt, and lab coat appeared on the screen.

"Good, Hyuuga, what is-"

"Wahh! Iona-sama, how's my baby goddess of war!" Hyuuga, whose eyes suddenly locked on Iona, suddenly burst in appraisal and excitement. "I'm so saddened that I didn't come for you, you could've been hurt! Owowhooo-wah!"

The obsessive yandere flew offscreen after she punched by blue-haired woman wearing a white dress.

"Oi! Hyuuga! We're here to report on Captain Gunzo! Save your lesby love-"

"Greetings, Takao, what's the status of the base?"

Cherry-red, Takao looked away and tried to conceal her embarrassment by standing straight and dictating the status.

"Well-umm-The ministry of-wah!"

Hyuuga suddenly appeared behind her and tried to push her away from the camera.

"Don't tell me what to do-"

"I'm talking to my 'oh captain, my captain'!"

"Save your tsundere behavior later-"

Gunzo and Iona sighed synchronously as the two girls fully went into tsundere mode in the screen, continuing to fight over the report as hair, cheeks, and other facial features were tugged upon in spectacular fashion.

"Those girls are going cuckoo for you, Captain Gunzo," Kyouhei said as he turned with a colossal grin, eyes focused keenly upon his superior officer.

"Well, they both like each other and they're best friends-" Hodzumi cut in.

"We're not best friends!" the two tsundere girls on the screen shouted in her direction. Hodzumi laughed nervously.

Both were launched away from the monitor after a bright green hexagonal panel shoved them away from the camera.

A 10-year-old girl with brown hair glowed into life on-screen. A bright white blouse and red ribbon, a dark skirt with suspender, and carrying a pink teddy bear in her right hand.

"Gunzo-san! Konbawwa!"

"Same to you, and merry Christmas, Makie." the captain returned.

Osakabe Makie smiled.

"Gosh, those two tsunderes are so annoying. Well then, Battleship Kirishima here reporting for duty," the teddy bear, despite her small handy sized, spoke roughly to the captain and began to report. Gunzo listened intently till the teddy bear finished.

"With Hyuuga's recommendation on the wall implementation," it summarized, "the ship's siding is completely repaired and can now withstand cannons attack without breaking. That is all."

"Thanks Kirishima." The captain paused when he noticed something. "Say, where's Battleship Haruna?"

"Oh, her? She, Makie and I were making gingerbread 'citizens', Christmas pudding and a house made of graham crackers-" She suddenly paused and her faced began to turn red. "I-I mean! Haruna and Makie only! Both of them are the ones making the-"

"Ginger bread citizen," Kyouhei snickered to himself.

"Shut up! A-a-a-anyway, we-Haruna, Makie and I prayed for your safe retur-" Kirishima's sentenced was cut when the screen suddenly become black. Gunzo blinked, startled that the communication was cut.

"Captain, communication from HQ was cut," Shizuka said as her hands swept over the panel, trying her best to reestablish connection.

Cut…? Gunzo suddenly felt a dark feeling building inside him. That doesn't look good, he thought then quickly commanded to Shizuha, "Get me the engine room."

"Yes, sir."

"Yes, Captain?" Iori appeared on the monitor, still in her happy and energetic mood.

"Is the engine good for turbo speed?"

Iori looked at the engine pod beside her which still emit a low humming sound then she looked back at the screen.

"Captain, about that, our engine is good for a turbo speed," she paused as she pressed a button on her console, "but it will saturate our Klein field since we're drawing from the auxiliary battery and our main battery is still damaged from our encounter with that rogue fleet of fog ships."

We're still far from Yokosuka, even if we go turbo now…Gunzo thought before he spoke.

"Just one is fine."

"Yes, sir!" Iori said as the video feed cut.

"Everyone, prepare for turbo," Gunzo shouted as everyone nodded and began bracing for acceleration. He glanced at Iona who was looking at him with a smile.

"Finally we can see our friends."

"Yeah. Hold on tight to me, Iona." Gunzo said as he held Iona's small right hand and smiled. "Let's go home and celebrate Christmas, late or not.

(1 Hour Earlier)

Surrounding the remaining parts of flooded Yokosuka was the mighty Wall, a defensive fortification once boasted to be so thick it was impermeable to any frontal attack made by the Fleet of Fog. In the distance lay the headquarters of the Blue Steel, Osakabe Residence Manor, undecorated for the Christmas festivities and overlooking the city like a looming vulture while the rest remained, for the most part, still merry.

"Phew, so cold!" a navy man complained as he tightened his thick jacket, struggling to keep warm at the very top of the wall.

"Act like a man, will you? We're skeleton crew; the seniors retreated to their beds." another said beside him as he glanced out at the dark ocean.

"It's 3 a.m., pal-huh?" suddenly the navy man saw a glittering object in the open dark ocean.

"Hey did you see that?"

"What?" his companion asked and used his binoculars to see. "I don't see any-"

Seeing something massive emerge from the water cut him short as it floated before him. The thing suddenly glowed in blue and gold, and his eyes widened in horror.

"Shit, it's a fog ship! Sound the al-" the man shouted before he was cut off by a resounding, powerful sound that echoed through the night sky. A flash of gold light emerged from seemingly nowhere and struck the top most portion of the wall where they were standing, killing both soldiers instantly.

(About 3 minutes before the attack)

In the snow-covered garden of the manor, Makie, after baking a lot of Christmas cookies for the homecoming crew of I-401, was sitting on a marble bench. She sighed peacefully as she looked at the cloudy night sky, spying the snow that fell onto the quieted city. She felt quite at home here, even as the two tsundere girls ranted and fought behind her.

"How dare you disturb my lovely communication to my admiral-!" one said.

"He wasn't even an admiral!" the other pointed out.

Kirishima who was talking to the camera that was hanging on a lamp post ranted.

"A-a-a-anyway, Haruna, Makie and I, prayed for your safe return-huh?" the teddy bear stopped reporting after she noticed the camera's red indicator suddenly turned off.

"I wasn't even finish yet…" she sighed as she walked to the bench, climbed up, and sat down.

"Snow sure is fun, right, Kiri-san?"

Kirishima clucked her tongue; she hated her nickname given to her by the girl.

"What's so fun about it? It's just frozen particles of water disposed by the clouds after it has gotten heavy."

"Yeah, but the theme!" Makie cheerfully added. "It's Christmas day! An event where everyone is happy and forgives their enemies!"

Kirishima looked away. This girl…she was a design child, not a human, and yet she is thinking naïve thoughts… Kirishima criticized internally as Makie stood up, picked a large amount of snow on the ground, and began forming it in her hand.

"Kirishima, the pudding is in the oven." A long blonde hair with two pigtails, wearing a long dark overcoat, which covered her whole body, appeared beside Kirishima. She looked at the little girl with her greenish eyes and smiled.

"It's been 8 years, 8 months, 36 hours, and 59 seconds since we first met Makie." She said calmly and peacefully as she continued to observe the girl.

"Yeah…and she never grows…always naïve," Kirishima criticized vocally this time. The comment made the considerably taller Haruna glance at her.

"Christmas, according to human history of events, was a time where humans reconcile with their enemies and forgive their sins against them."

"Yeah, but it sounds stupid," Kirishima continued while standing up. "Humans are chaos-driven creatures. They can forgive now, but they will still repeat what they'd done to others." With a snort, the teddy crossed its furry, cotton-stuffed arms.

As the two observed the child, the tsundere girls continued their rant behind them.

"I told you! Your cookies suck; it even made the poor dog sick!" Hyuuga thundered, pulling the cheeks of the heavy cruiser Takao as hard as she could.

"Shut-up! My curry flavored buttered cookies are the best!" Takao thundered back, pulling the cheeks of the large battleship Hyuuga in equal measure.

"You're so-" Suddenly Hyuuga stopped her rant and let go of Takao. She turned around and looked at the wall on the horizon. The other girl, startled from her reaction, asked.

"What is it?"

Hyuuga, squinted her eyes while staring at the wall, said. "Something's coming-" as if it was a cue her sentenced was cut when a loud sound of a cannon echoed through the night sky and seconds later they saw a flash of light on the center of the top portion of the wall.

The girls looked at the wall, startled from what happened, as it the top portion began to burn.

"What the hell?!" Kirishima asked, startled from what happened. "Oi, should we attack now?"

"Girls, battleships now," Hyuuga said with immutable calm, taking out an egg-shape device from her lab coat.

"Makie, stay here. Haru-nee-chan will protect the wall," Haruna uttered.

"Haru…be careful, okay?" Makie asked worriedly. The blonde girl smiled with assurance before all three of the mental models ran together and jumped off the edge of the cliff. The cold air didn't bother them as they landed on each of their respected battleships.

"Main engine start!" the three girls synchronously shouted as their ships' engines roared to life.

"Ok, ok! Now this is getting interesting!" Kirishima said as her battleship passed through the others, leading towards the wall with her glowing green self.

"What's this? Looks like someone knows how to start a Christmas party," Takao said as her ship glowed in red and her funnel produced a thick, inky cloud of smoke.

"It is nice…" Haruna paused as her whole battleship glowed in yellow, "but we don't accept visitors without invitation."

The three girls sailed towards the gate, spoiling for a fight and armed to the teeth.

Hello there; this is my new story, a crossover between Assassin's Creed and my new favourite anime, Arpeggio of Blue Steel. (This anime is so cool for me :)) Anyway, here are some terms that some of you might have found difficult to digest:

The Super Gravity Cannon-or "Super Graviton Cannon"-is one of the most powerful weapons within the arsenal of the "Fleet of Fog". Normally, only heavy cruisers and above can be equipped with Super-Graviton Cannons.

Klein Fields are so called impenetrable shields of the Fleet of Fog. Each vessel is equipped with it.

Design children are genetically engineered humans with super-human abilities in a certain area of expertise, ranging from weapon creation or politics.

Special thanks to Daedalus370 for beta-reading :)