DO NOT BUY THIS GAME!
It's an episodic project each one 6h long. While the story seems interesting the dev pretty much abandoned it altogether. They're focused now on making side stories or prologues while not having finished the main story. And it's been over 12 years now. And even now, as of this moment I'm writing they stil claim on their site to be releasing new episode every 6 months or so. Moreover, during making the next episode of prologue, they decided to scrap it just 2 weeks before the promised date of release, and remake it in an entirely different genre - 3d action game, most likely to string any remaining patron along.
Honestly it breaks my heart because the art and the story are so intriguing and lovable. I didn't even miss the voice acting. Alas it all went belly up.
All in all - my honest advice - don't give the devs any money. They clearly don't seem to intend to finish their project.