The Past Rediscovered: Keves

When an unexpected glitch occurs within Origin upon the separation of Aionios, Noah and Mio awaken to find themselves not only together, but face to face with a younger version of Panacea's mentor, the man said Liberatrix honored as the founder of House Reid rather than herself, and one of the Liberators: Shulk

Quickly realizing that they had been transported to the not-so-distant past of the world that had ultimately become the nation of Keves back in Aionios, Noah and Mio integrate themselves with the people of Colony Nine, becoming objects of curiosity for those who call the Colony home, especially so in the case of Dickson.

Not long afterwards, an armada of murderous machines known as the Mechon that had been presumed annihilated, catch Colony Nine with its pants down and launch a surprise assault, resulting in the tragic death of the girl that Shulk truly and deeply loved, who set out on a mission to wreak vengeance upon the Mechon, with Mio and Noah joining them on their journey.

Things become infinitely more complicated and chaotic from there.