Moonglow is a new story, the previous one ended with Ghostlights.
What I gathered from the previous storylines...
THE WICKED TRILOGY:
A tormented and disturbed composer wants to create music. He falls in love, he gets dumped, he directs his energies into creating a symphony that will show the world (and the girl) how awesome he is, then says "screw it" and symbolically tells the girl to piss off, and then gets... ehr... lost in space, I assume metaphorically.
He dives deep into addiction (chops his breafkast on a mirror so to speak), refuses the hollow fame and glory, and eventually ends up in a padded cell in an asylum. Maybe one day he will find true love however. Maybe. Dunno.
THE MYSTERY OF TIME SAGA:
The protagonist, Aaron-something (can't remember now), is a young alchemist in a fanstastic version of the 1800's that stumbles upon a conspiracy about a secret organization that.... mh... controls time? steampunk sheaningans ensue and, in the second act, some ghostlights appear. Dunno. There's also the devil in there somewhere. Eventually we meet the master of the pendulum, the villain that... mh... does stuff? it all ends somehow with obsidian skies. Really, I can't make more of this.