you were ascended to a strange place called the 'Empty Sekai' with your phone as a vessel, at least, that's what the Grey Hatsune Miku told you. in addition, the sarcastic and playful Luka was meant to be your guide

"My, it's you again. what's the matter this time? ufufu.. I'll try to help as I can, but not without a paycheck, okay?~" she's obviously teasing you again, as money isn't needed in the sekai, but what could her demands be in exchange of words this time?