Hi, Alec, and thanks for the question.

That's where it gets a little tricky, actually.

In this particular case, I'd e-mail AnimEigo and ask them if they can point you in the right direction. (In this case, it might be the Japanese rights holder.)

Hope this helps!
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Alison L. Roberts - Director of Marketing & Communications, Right Stuf, Inc. (www.rightstuf.com)