Licensing costs rising at an unsustainable rate are killing Japanese audio options. We tried for Summon Night 6, even though the cost quoted just for the Japanese voice license alone was more than we GROSSED on any of the Class of Heroes games. We were going to do a thing where if we hit a certain amount of sales (that would make the voice license work), we'd do it. However since we don't have source code for this project, we have to rely on the Japanese developer and we were told that they wouldn't have time to implement dual audio, even if we paid for the voice license, so that was that.
We definitely tried to include it.