Tetsuya Nomura: There was a possibility that Kingdom Hearts would only have one installment, so Kingdom Hearts: Birth by Sleep was not something that we had planned from the get-go. However, by the time we were working on Kingdom Hearts: Chain of Memories and Kingdom Hearts II, we had already started to piece together Kingdom Hearts 358/2 Days [and] coded and Birth by Sleep. Ultimately, we wanted to resolve the mysteries that have been scattered thus far, and to clarify what mysteries lay ahead in the series. Right now, you could say that we've entered the preparation stage, heading toward the conclusion of Xehanort's tale. I hope everyone gets to see the secret ending.
Then release the Final Mix versions outside Japan!