It's possible to translate but would require a great deal more work than a similar game for a good quality translation.
I was lucky enough to get a seed on the torrent and have mirrored it here for your convenience:
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A little bit of googling also led to a .sl decryption tool (available here:
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) which conveniently converts the files into .txt. From there they can be translated and encrypted to overwrite. It works fine but the system is intended for Japanese and the aggressive word wrap breaks words in the middle. Furthermore, you need to jump through a few extra steps just to track down which .sl file is associated with each call.