He only brought about 15 copies to the convention (though he took 60 copies of the music album), all of which sold out, there were also additional copies online that sold out, but I'm not sure how many in total were printed as of now.
The book has since then been restocked though. ^_^
The circle's name is A Reyvateil's Melody (ARM for short), I'll be credited as Palsa in the book, with a link to my DeviantART, Pixiv and Twitter pages.
I actually named the book, it will be called: 'Astraea: Illustrations from A Reyvateil's Melody'.
The name Astraea comes from a Greek goddess of the stars, the cover will depict two characters: Misha Arsellec Lune (in her adult form) from the Ar tonelico series, who is refereed to as a Star Singer in the game; the other will be Iris Fortner from the Atelier series, who is a reincarnation of a creation goddess; between the two, the name felt rather fitting.