@datschge thx for verifying it.. its was work and i can play most of the file now (some of them aren't work like this one (lenght are 3 minutes probably a bug? could you verify this aswell?) here the sample that doesn't work: https://my.pcloud.com/publink/show?code=XZvjAGZAm5xQ501f08BOQltFc91OY1Kg5i7
i would upload it on but got low-speed connection here with a terrible issue with upload.. probably i can upload it in my cloud per-file then pack it digitally as zip.
Seems like what Infernus Animositas indicated is correct, the game uses different keys for different parts. Unfortunately it won't run on my Bluestacks so I can't rip it on my own. Ideally somebody who also knows how to find the keys does a rip of this.
If you like to proceed anyway you can share the remaining individual hca files (how many are there?), then I'll assemble then. For the non-working files maybe ssh can help out.
use this emulator (with backup) : http://pc.cd/9Pw7 (install memu,rc5 then import) (its have old apk update it first) to dissamble them just open-up vmdk with 7-zip the navigate to game data (you should find it easily)
500+(CPK include voice over and BGM) over hundred audio(.hca files) if i extract them, it can be played except 3 minutes lenght files. i would upload it soon on pcloud slowly.. i will inform you in here datsch, if you want more faster way probably you can dissamble by your-own way since the game use somekind interesting encryption on its core files (sprite,text,images,script)
ah nevermind the file(00048_BGM_EVENT_44) can play perfectly (i decompile them again) here some uploaded file i share with my friend (fb) and fellow on group : http://pc.cd/p3q7 thanks for you hardwork... the one who make this things possible as a freakout to find out audio does get locked with terrible encryption.