[Ushinawareta Mirai wo Motomete] xp3 either encrypted or corrupt output files?

[uguutofu]

Hello peeps,
I've been trying to extract scripts from Ushinawareta Mirai wo Motomete in hopes of perhaps starting a translation project, however I've tried most of the tools avaliable (crass, AE, kirikiri tools, etc) but the output is always "corrupted" and even the header for all the files seem to be messed up. Could anybody point me to a good direction for extracting these kind of files?

Thanks in advance!