McDonough's Rest. A small town built out of a long abandoned IMC facility on Typhon. The folk here don't know what it was for, and for the most part don't care. It's shelter from the native creatures, and any storm that might roll through, and that's enough for any frontier settlement.
The trouble comes when the Remnant Fleet decides they want it back. The Frontier Militia and IMC alike have pulled out of Typhon since the planet's devastation at the hands of the Fold Weapon. An unusually kindly Fleet captain has demanded the folk of McDonough's Rest to depart within the week, or be slaughtered wholesale(this being unusually kindly, as the usual modus operandi would be to just get on with the slaughtering and take what they want).
With no Militia help, McDonough's Rest faces death, either at the hands of the Remnant Fleet, or the prowlers out in the wild, should they try to flee. The grandchild of the town's namesake, Patrick McDonough, has set out in desperation to find anyone, Militia, mercenary, even IMC, that would protect them, or allow them to flee.
A handful of pilots and their titans answer the call.
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Obviously being familiar with Titanfall and Titanfall 2 wouldn't go amiss, but you don't really need to be. All you need to know is that a pilot is an elite fighter, partnered by a neuro link to a titan, a bipedal war machine.
Due to the expense to build a titan and train a pilot, most are in the employ of one of the larger factions out in the frontier. Even so, there's a fair amount that work as mercenaries, either independently, or as a mercenary company.
The premise of this game is basically the plot of The Magnificent Seven, set in the Titanfall universe, with pilots as the cast. It doesn't have to literally be seven(in fact, I'll probably title the game based on the number of players).