Okay, so I made this AU crossover snippet in Spacebattles in the MGE: Hammer Edition Threads prior to the creation of this story and they're all prototype chapters. Therefore, in my conclusion, I just want to dump these snippets into FFN and see how it goes.

Then the result of this crossover snippet has made another story that crossed my mind. So then, AoTxMGE story, here we go!

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To all rights reserve, both series belonged to their respective owners. Attack on Titan belonged to Hajime Isayama and Monster Girl Encyclopedia belonged to Kenkou Cross.

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Chapter 1: That Day.

Divine Heavenly Realms.

...

On the throne of the heavenly realm sat the wounded Chief God. The deity observed the humans in their mortal realms and carefully sees their activities. It's been over a millennium since her hard-fought battle against the Succubus Demon Lord and her husband, which resulted in her defeat. Now stuck in sitting on her throne and her teeth gnashed, still feeling frustrated after her defeat while her powers are barely recovering.

"Hmm? What's this?"

The Chief God raised her eyebrow in confusion. She leaned close to inspect to see her visions to the mortal realms were getting distorted. This hasn't happened before until the magic vision of the world became stable once again until she felt something went wrong.

She noticed some Order States went missing in a blink of an eye. Including that peculiar human Order State; the Theocracy of Lescatie disappeared as well.

"Wait... what's the meaning of this!?"

In other Divine Pantheons of the Gods, both neutral and monster divinities noticed many Monster-friendly states and Demons Realms went missing over a single night as the world spins, except for the other nations, including the Royal Makai, which are still present in the world.

In the Royal Makai, the Demon Lord Lilith sensed a massive disturbance in her mana, as if millions of her brethren were still breathing under one night and then were suddenly silenced in an instant. This sort of disturbance which Lilith has never felt before until she saw the doors of her throne room opened and a single witch came in, breathing heavily with an expression of panic.

"Y-Your Highness! I bring grave news!"

"Hm? What is it? Did something happen?"

"W-Worse!" The Witch replied in a shaken tone. "The Demon Realms... Pimor, Dyfed, Guelders, Sussex, and Thomond... th-they're gone!"

In a single night, the entire world was thrown into disarray when the disappearance of nations occurred worldwide. Not even the Gods knew how it happened after the mysterious cataclysm had occurred.

...

By the year of ME 1026; during that day.

On the City of Lescatie, two children witnessed black smoke coming from outside the city walls until a giant hand lay on top of the city gates before a tall 15-meter humanoid gigant emerged, overshadowing the people and the children. Its appearance is bald, has blank eyes and exposed teeth.

Mankind and Mamono... received a grim reminder.

The citizens soon stepped back in fear while eyeing the giant that stood in front of the main gates until more of them emerged and they share the same appearance with some deformities. The giant on the city gate made a creepy smile before the rest of the giant humanoids came crashing through the walls while some soldiers screamed into their deaths as the walls collapsed. The people froze as dread and death crept up on their spines until they ran away out of fear while some unlucky residents were caught by the giants and were eaten alive.

Among the fearful crowd stood three children, a girl and a boy watched in horror to see naked humanoid giants devouring the people in front of their eyes, followed by the horrified screams of their victims. Soldiers and Knights came to fight the giants in a hurry until they stood at a halt and witnessed the gruesome horrors in front of them.

"M-Men! Charge in the name of the Chief God!" The captain yelled before leading the troops to fight.

While in the midst of chaos, the aqua green-haired girl snapped out of her stupor before holding tight onto the young boy's wrist.

"E-Elt!" She yelled, pulling him away while they ran. "We have to get out of here!"

"Sasha, wh-what are they!?" The young boy named Elt questioned out in fear. "A-Are those real monsters!?"

"Elt! Snap out of it and run!"

Elt snapped out before they turn away and fled along with Sasha. The children hurried their feet through the alleys and entered the slum district of the city while many residents fled from their houses. Once Sasha took a sharp turn, her eyes widened in horror once she saw several tall humanoids that stood from 3 to 4 meters, ravaged the orphanage. Elt shared the same reaction as Sasha while standing there; watching hopelessly as the children of the Orphanage were devoured, letting out dying screams and begging for mercy.

"Sasha! Elt!" Sasha then heard a familiar voice coming nearby and saw Nun running at them while holding two children by their hands, exhausted and almost to the brink of collapse. "Thank the Chief God, you two are alright! We must leave the city, quick!"

At this moment, Sasha widened her eyes in terror as she speaks up. "B-But that can't be! What about the Heroes, Mama! They're supposed to save us!"

"The Heroes can't save the city in time!" Her mother held her tightly by the shoulders. "These giants have overrun the city and they get devoured as well! We must leave now!"

"B-But I thought the Chief God's Heroes will save us!" The little boy with silver hair said, with his tearful expression filled with fear.

"I know Yuriy, but they're too many!" Sasha's mother hushed before she led them down through another alleyway as they run to the docks as they could. "We must head to the docks and Eristia, don't fall behind!"

The little girl with orange hair couldn't help but keep her feet on running while panting heavily for breath in exhaustion.

On the principal streets of the city, citizens ranging from humans, kobolds, and holstaurs ran from the giant menace while others that get left behind were being eaten alive by the gluttonous mouths of the giants. Meanwhile, the soldiers of Lescatie lined up their cannons and aimed at their giant enemies. One Hero stood in front of the human soldiers and raised his sword.

"Fire!"

The cannons unleashed their payload, and bloody explosions erupted through the giant horde. The lescatian soldiers cheered in joy for victory before the hero noticed something went wrong. He widened his eyes once he saw a headless giant slowly stood up. The soldier's cheers slowly died out one by one and they soon expressed their fears while more giants with missing body proportions stood up. The Hero noticed missing limbs and heads regenerated at a rapid pace in much to their horror and dismay.

"B-By the Chief God, that can't be!"

"Th-They can heal themselves!?"

"I have a bad feeling about this, we need to run!"

The Hero noticed some soldiers ran away before he raised his sword to give out his speech. "Do not falter! You've dedicated your lives to defend this city from these giant monstrosities!"

The soldiers listened to his words, and they trembled before their giant opponents. One Knight saw a giant expressing the scariest smile he had ever seen. But regardless of the situation, the humans stood proudly because they have a hero on their side. The Order Hero prepared his sword before they charged into battle against the Giants with their weapons raised.

"Charge!"

The Hero and the soldiers charged head-on and just before they would clash. A 3 meter giant with an enlarged head leaped out from the nearby alleyway and its mouth ripped off the Hero's upper body without warning. The soldiers watched their Hero was devoured by the giant monstrosity before a 15-meter humanoid smashed their ranks with its bare hand and the soldiers scattered.

...

Behind the Order City of Lescatie, the people crowded themselves at the pier while refugees boarded the ships before departing themselves through the large rivers where it leads to the seas. Among the refugees, soldiers make way for the Royal Family and its trusted nobles. Francesca walked behind her mother while observing the faces of the frightened citizens. Franchia Reinel, the Queen of Lescatie, shared the same reaction as her youngest daughter while she could see the distraught among the people.

But the people soon turned sour once they saw the Bishop of the city. Bishop Noscrim stood with a high and mighty attitude while following the royal family behind, while his wife and daughter stood by his side.

A ship painted in pure white docked itself on the pier before the King and the Bishop boarded along with their family. The citizens expressed their anger at them until they threw pebbles and rotten food when the ship departs to vent out their frustration against the King and the Nobility. They knew that ship itself had a lot of rooms, which can house more people inside. That alone is enough to piss them off as they felt being left behind.

At the gates of the docks, more people rushed in like frenzy, seeing that the giants were closing near. Sasha and the children got lost in the crowd until Eristia tripped into the ground and was nearly trampled by the frightened citizens. Sasha helped her to get up and headed to the docks until she realizes someone went missing.

"Get aboard! We don't have time!" A Seaman yelled as the crew dropped the bridge.

The children followed the refugees as they board the ship. Elt looks around and saw Sasha, Eristia, and Yuriy were on board. But he widened his eyes in realization.

"B-Big sis! Where is Mrs. Fullmoon!?"

Sasha gasped in horror before she turned around and see the docks are full of people. Then she saw her mother was among the crowd before a couple of giants crashed through the walls and ran to the refugees as they saw them as nothing more but a buffet for their gluttonous mouths.

"Mama!" Sasha screamed in terror as she ran to a nearby sailor and begged. "We have to go back! Mama is still there!"

The sailor stared down at the child before looking up to see the giants have overrun the evacuation site. The sailor couldn't help but express his sadness to the little girl.

"I'm sorry... but we don't want to risk any more lives..." He said while looking down solemnly. "There is nothing we could do to save her."

Back at the docks, the people scattered around while being chased around or eaten by the giants. Mrs. Fullmoon stood at the edge and saw the ship that had just left the docks, and her eyes widen once she saw the children were among the refugees on the ship. She saw her daughter crying for her before the nun slowly expressed a sad smile.

"Live on... Sasha..." The Nun uttered as tears trailed down before a couple of giants approached her from behind. "Please... take care of Elt... Eristia and Yuriy... Live on!"

The nun broke down a sob before a massive pair of hands gently grabbed her before the giant tore her apart and swallowed her. Back on the ship, Sasha watched in horror to see her mother was devoured right in front of her eyes before her knees slumped down. Her eyes were now stricken with dread and terror.

The young girl couldn't help but mourn with a silent sob.

"Mrs. Fullmoon..." Elt uttered until his eyes welled up in tears.

Yuriy and Eristia looked up at the older orphans and saw their saddened looks on their faces. The young orange redhead then wraps her arms around Yuriy and the young boy looked down and sees Eristia broke up in tears as well.

"Yuriy... I'm scared..."

Yuriy then cooed while he returned a hug. "Don't worry... we'll be fine."

...

"At that the day, since their arrival... they soon learned and live under the fear of their new, mysterious enemy known as... Titans."

...

Out from the burning city, the ship itself sails into the lands unknown. And on that faraway land stood a land of walls. Inside the military barracks, a certain trainee is writing a journal under the tree in his free time until he noticed an eerie feeling that brushed through the winds.

"What... was that... just now?"

Chapter 1: Ends.

So, what do you guys think? This first chapter is brief, but it's a prologue before the storm.