Can't extract Kara no Shoujo 1 & 2

[furanzoni]

Game info

VNDB link: https://vndb.org/v810 & https://vndb.org/v5922
Developer: Innocent Grey
Release date: 2008 & 2013
Original title: 殻ノ少女 & 虚ノ少女
English title (if available): Kara no Shoujo & Kara no Shoujo - The Second Episode

Details

I think your unpacker refers to other version of the games, since even putting the correct CLI invocations it still does not extract, as if like it thought the game use other format.
Some info: Kara no Shoujo 1 (English/Mangagamer version at least) uses the Kirikiri engine, thus the gamefiles are .xp3. But arc_unpacker think they are packdat or something?

./arc_unpacker karanoshojo.xp3 --dec=innocent-grey/packdat
[task 0] karanoshojo~.xp3: initial recognition...
[task 0] karanoshojo~.xp3: guessing decoder among 1 decoders...
[task 0] karanoshojo~.xp3: not recognized by any decoder.
Executed 1 tasks in 0.01s (1 problem, 0 saved files)

And even if I say to arc_unpacker to use kirikiri, it still doesn't work.

./arc_unpacker karanoshojo.xp3 --dec=kirikiri/xp3
[task 0] karanoshojo~.xp3: initial recognition...
[task 0] karanoshojo~.xp3: guessing decoder among 1 decoders...
[task 0] karanoshojo~.xp3: recognized as kirikiri/xp3.
[task 0] karanoshojo~.xp3: recognition finished with errors:
[task 0] karanoshojo~.xp3: No plugin was selected.
Executed 1 tasks in 0.11s (1 problem, 0 saved files)

Kara no Shoujo 2 (English/Mangagamer) uses Unity engine, but arc_unpacker think they are iga or something.

./arc_unpacker cg_bmp.pac --dec=innocent-grey/iga
[task 0] cg_bmp~.pac: initial recognition...
[task 0] cg_bmp~.pac: guessing decoder among 1 decoders...
[task 0] cg_bmp~.pac: not recognized by any decoder.
Executed 1 tasks in 0.06s (1 problem, 0 saved files)