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plugin added based on AES 256 observed in process
Compiled and decrypts

font.npk
script.npk
system.npk
voice.npk

Invalid byte sequence on all other .npk in folder

[000000000114EC20] Found AES-256 decryption key: d0b71f3c4e24cecfddeea91d24b0403229a3e5330d2951826051d6c94af5af54
[000000000356BABC] Found AES-128 encryption key: 300100000700000058ac000058ac0000
[000000000356BB5C] Found AES-128 decryption key: 300100000700000058ac000058ac0000
[000000000375BB0C] Found AES-128 encryption key: 300100000700000058ac000058ac0000
[000000000375BBAC] Found AES-128 decryption key: 300100000700000058ac000058ac0000
[000000000B77F390] Found AES-256 decryption key: d0b71f3c4e24cecfddeea91d24b0403229a3e5330d2951826051d6c94af5af54

This works on copies bought directly from JAST, the Steam release shows this aes 256 key, and did not decrypt when compiled. 
[00000000009DED50] Found AES-256 decryption key: 763a14338b0dac040accfc13851cfacbb20b000b01f868486b460f8c34d42a96
[0000000003C0419C] Found AES-128 encryption key: 300100000700000058ac000058ac0000
[0000000003C0423C] Found AES-128 decryption key: 300100000700000058ac000058ac0000
[00000000090471DC] Found AES-128 encryption key: 300100000700000058ac000058ac0000
[000000000904727C] Found AES-128 decryption key: 300100000700000058ac000058ac0000
[000000000C34F400] Found AES-256 decryption key: 763a14338b0dac040accfc13851cfacbb20b000b01f868486b460f8c34d42a96
Saya no Uta JAST English support added.
@deathzombee
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at least as far as I have tested the files
font.npk
script.npk
system.npk
voice.npk
use the iv: 00000000000000000000000000000000
and the files
cg.npk
N4_sys.npk
sound.npk

they use the iv: 300100000700000058ac000058ac0000

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