[Request] HCA key

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Game: Sengoku A live (Android)

https://www.mediafire.com/folder/acfarturezgdl/help_me_please_lol

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I noticed is actually possible to hear the audios in foobar2000 adding the .acb extension to the files, maybe there is some way to get the key using that instead of analysing the game files.
my intention with the key is using it for getting the videos of the game