How to extract data from a PS Vita game? [Sword Art Online Lost Song]

[KosukeTeam]

Hello ZenHax members!
I just want to extract some files from Sword Art Online Lost Song (PS Vita), but I saw that files are compressed in .apk format, How can I extract the data?

Data: https://mega.nz/#!6d0GhIzb!HKf-LOWD-yoP ... 5Uaa7yAl0M
Data Rom: https://mega.nz/#!uV9GwSLK!FvE3bbEKmqn6 ... H8YtQwPm4Q
Thanks!

[aluigi]

It's the same format (ENDLITLE/PACKHEDR) used by this game:
http://aluigi.org/bms/dragon_ball_z_boz.bms

[KosukeTeam]

Thanks so much! but how can I open .anm files?

[aluigi]

Unfortunately I can't help with the content of the extracted files.