Snippy, Engie, Pilot and Captain end up in Equestria after a series of strange events in Capteinia. Shenanigans occur. Yes it's a Romantically Apocalyptic/MLP crossover.
Octavia hasn't been herself lately. Voices speak to her, but belong to no one and bodies of ponies materialize from the shadows. She seeks to find the source and put an end to her constant torment.
It's hard to admit that things are your fault to other people, and sometimes harder to apologize for past mistakes. But there is a heavy weight off the shoulders once the truth comes out.