Possibly. I will of course need music and sound somewhere down the line, and it might be good for a composer to get started on something now, but currently the game is in a very early stage, so I'm not sure what that would mean for a sound designer (I'm actually embarrassed to say that I don't know what a sound designer would technically do since I've never worked for a proper game company. Is this the person who would actually make the sounds for the game?).
This will be a full-fledged 3d action game, it won't have chip-tunes or "video-gamey" music. It will require orchestral and hopefully some traditional Japanese-sounding stuff (though it can be primarily orchestral). I would be extremely happy if it sounded close to this soundtrack: www.youtube.com/watch?v=zQomELODboM&list=PLE3AB8EE49480E65A&index=3&ab_channel=B...
I imagine this might be fairly hefty to produce. If you still want to, after hearing all that, I think the best thing to do would be to try to produce kind of a short "proof of concept" track and I'll see if it fits with what I'm imagining for the game.