Disclaimer: I don't own Gate - Jietai Kare no Chi nite, Kaku Tatakaeri/Gate - Thus the JSDF Fought There or A Song of Fire and Ice. It belonged to the respective authors: George R. R. Martin and Takumi Yanai.

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Prologue:

In 21st century. A mysterious gate suddenly appears in Ginza, Tokyo where legion of Roman/Macedonian-style soldiers led by men holding a whip come out from it and attack the people. Youji Itami, a JSDF (Japanese Self-Defense Force) soldier, who was attending a nearby doujin convention, Richard Walker, a BAF (British Armed Force) soldier, and Lyar von Ertiana, a Bundeswehr soldier, both were taking a relief duty, takes action by organizing the police to evacuate the civilians and tourists into a palace to protect them before the relief force arrives to stop the invaders. Due to their actions Itami, Richard, and Lyar promoted from their respective governments and three of them celebrated as a national heroes, "Three Heroes of Ginza". The appearance of the Gate and massacre of civilians and tourists, dubbed the name 'Ginza Incident' or 'Battle of Ginza', prompts the governments of Japan, Britain, and Germany to take action by establishing the Three-Nation Alliance and send a military joint task force to the "Special Region", the world beyond the Gate, to not only explore the new world, but demand reparations from those responsible for the attack. After 3 months of preparation, the three governments sends off the Joint Expeditionary Force to their mission to the Special Region with Itami, Richard, and Lyar as part of the task force. After finally arriving, the task force encounter entering a world of swords and magic exists, and they will prepare for the upcoming battle.

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Joint Expeditionary Force

Type of government: Expeditionary and Military

Main Leader: Sir/GeneralIntegra Fairbrook Windgates Hellsing

Secondary Leaders: JSDF Lieutenant General Hazama and Bundeswehr Lieutenant General Wolfgang Woerns

Location: Atria Hill, north of the river of Skahazadhan and slave city of Meereen, Slaver's Bay, Essos

Capital/Base-of-Operation: Atria Garrison

Formed from:

State of Japan

United Kingdom of Great Britain and Northern Ireland

Federal Republic of Germany

Date established: 2015

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Characters:

Allen Walker (Age: 19/D Gray-Man/Imagine without deformed arm and left-eye scar)

Negi Springfield (Age: 18/Negima! Magister Negi Magi)

Carson Beckett (Age: 32/Stargate:Atlantis)

Victoria Seras (Age: 18/Hellsing)

Knight Valentine (Age: 20/ Shinkon Gattai Godannar!)

Ellis Valentine (Age: 20/ Shinkon Gattai Godannar!)

Suzanna Bluestein (Age: 18/Divergence Eve)

Kiri Marialate (Age: 18/Divergence Eve)

Lyar von Ertiana (Age: 29/Divergence Eve)

Rip Van Winkle (Age: 27/Hellsing)

Eren Yeager (Age: 18/Attack on Titan)

Mikasa Ackerman (Age: 19/Attack on Titan)

Armin Arlert (Age: 18/Attack on Titan)

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Author's Note: I apologize if it's a short chapter, but I'll update the next chapter.

A/N 2: A fictional hill like Alnus Hill.