Charlie was just beginning to feel her life was back on track. She had a new home, a crew to run with and a semi stable income stream. With just two or three years til she could unlock the [System] on her twentieth birthday and gain her first [Class] Charlie had put the setbacks of the past behind her. Perhaps she might gain the [Runner] class or even just a [Stablehand] class. She has always liked horses and they liked her. In fact she was good with all sorts of animals. Any [Class] relating to animals would be great. But [Fate] is capricious. And Charlie’s fate is beyond any that have gone before. It is even beyond the [System] itself. Truly she will be in [Uncharted Waters] with nothing to guide her and no idea what may be about to swallow her up.  Just to clarify - this is a [Reverse Isekai] for those who missed the clue in the title. I have no idea how it may progress, writing this by the seat of my pants, single finger typing on my phone while camping as part of the Jan 23 magazine challenge.  Join me, and Charlie, as she navigates a strange and unfamiliar world outside and a completely new and unmapped [System] inside.  And where the [System]’s boundaries are stretched it will surely grow till it encompasses all.