It is likely a continuation of a story titled "Luna's Fall from Grace" (often associated with My Little Pony fan fiction, though this specific title could be original content) [1].
If you can share this is, I can tell you more about the characters and plot!
The 0.28-0.28 likely refers to a specific draft or update version of the second chapter [1].
Based on the file naming convention "Lunasfallfromgrace.ChapterTWO0.28-0.28-pc...", this appears to be a segment of a or a visual novel/game [1].