With Aselia the Eternal going on sale on steam, I picked it up (along with Seinarukana), and it's been a good read so far. However, the game invariably crashes (no error message, apart from a popup "aseliacs has stopped working".
This happens just after a screen introducing a new chapter (it reads "Prologue, Girl With the White Wings, To a different world").
If I were to venture a guess, I'd say the intro move was supposed to play at this point (it seems about that time), but I can't be sure.
Others on steam seem to be reporting the same problem, these past 10 days or so.
And http://steamcommunity.com/app/445420/discussions/0/357284767241205770/?ctp=3 (Malark's post of March 21st).
I hope this is something you can help with.