PSU Writes:
"Earlier today, we had the opportunity to interview Yoshito Okamura, Gust Game Director on Atelier Ayesha: The Alchemist of Dusk. When asked about Western demand for Japanese audio as a dialogue option, Okamura-san professed he was quite surprised when he first learned that the option was in high demand: "We thought that Japanese audio was a feature enjoyed primarily by just the Japanese fans, so it honestly took us by surprise seeing and hearing the huge reaction and passionate requests from the overseas fans."
Do it!
Japanese audio is a highly requested feature imo