Here is the link to buy the game at DLSite English:

Princess' Edge - Dragonstone at DLSite

or if you prefer to buy it at DLSite Japan, you can use this one instead 😀

DL Site

Oh, and please note that at this time, there is no yuri content in the game, sorry T__T .. I will love to add it someday in the future though.

Here is the v0.16a Update to fix the gamepad bug, simply overwrite the previous files :D!