Disclaimer: I do not own the Gate JSDF franchise, it belongs to its respective owner.
Prologue
A portal appeared on a hill, a sacred hill.
It has been around two thousand years since the last time it was open. Many species came out from that portal for hundreds of thousands of years aside from the original inhabitants of this magical world. They include dragons, orcs, dwarfs, goblins, rabbit-eared vierans, and others. The most recent are a group of beings called humans. In those millennia, this humanity had spread through the continent, establishing villages, towns, cities, and kingdoms. When the portal opened once more, it was discovered by a group of humans representing the most powerful governing entity called the Saderan Empire. They send a scout to find out what was on the other side of the portal.
Unbeknownst to the Imperials, a group of sentient beings are observing the activities surrounding the site. They were unseen due to their devices' ability to bend light and in tandem with integrated clothing emitting the same power, making their whole bodies virtually invisible to the naked eye. Without their cloaking devices and clothes, these individuals would have looked human-like in body shape with exceptions of various numbers of eyes on each head and armor covering almost everywhere on their bodies. Additionally, their armor are compatible for invisibility, which is made easier by the fact that they're not human. Scratch that, they're not even flesh and blood to begin with! The diverse sets of weapons the group carried are similar to crossbows except they shoot energy blasts that would easily melt through any armor made by the local inhabitants and are all designed for stealth operations.
With the humans done with their mission for the time being, the cloaked operators send out their smaller scout units to investigate the portal. The undetected air drones conduct data gathering with ease thanks to their invisibility and quiet propulsion. One of the flying machines enters the portal, which then carry out surveillance on the area at the other side of the portal for a short time before returning back. An hour later, the metallic scouts come back to the main group without disturbing the Imperials. They review all the information collected from the areas on both side of the magical opening and on the phenomenon itself. What all of this means to the recon team will definitely influence the course of action that their entire organization will take on this world… as uninvited guests for over a millennium.
"Can I jinx something for this situation?" One member of the team asked.
"No." The leader responded
"Ahh… fine."
A/N: I decided to post this concept since it seems that someone hasn't thought about sci-fi robots in a fantasy setting before and that I'm becoming a bit more inpatient with updates on some of the fanfictions related to GATE. As of this moment, these 'robots' aren't sure what will come out of the portal - be it the JSDF, US armed forces, NATO, Russians, or something else. Thus this scenario is open to any possibility that the metal visitors will have to deal with. The upcoming chapters will be more expositions than dialogues on their arrival to the GATE world, observations on the inhabitants, and how much they interact with that place. Anyway, you're free to make comments, reviews, suggestions, and pros and cons on this robot/fantasy concept considering that I'm a newcomer of this website. And if you decide to make a better story out of this setting, then I'm alright with that.