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Well, it turns out that Maaya Sakamoto doesn't like mixing her career as a singer with her career as a voice actress, as she pointed out in an interview with director Masaaki Oosumi1:
Sakamoto: [laughter] [...] I'm old-fashioned - I don't want my work as a voice actress to get mixed up with my singing.
—What exactly do you mean by that?
Sakamoto: To me, my ...
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