I would ask yourself what your plan was when you bought it? Any investment purchase should be done with a plan, and unless your plan was to live there in 1/2 of it until you die then I would just continue on with your original plan (just maybe accelerating the dates it sounds like).
If this change of circumstance changes your plan as well then just re-evaluate based on your new situation. For example, do you enjoy real estate? Will you be coming back to the area after an assignment in Japan, or would you end up in an entirely different area? What are your numbers on the property? Are you making money on it (or would you, after moving out and hiring a property manager)? Would you consider selling on a lease option or seller financing so you could still receive some monthly income but not need to deal with the property itself, or would you just want to sell outright and move on?
Bottom line is that only you can decide what works best for you. If you do decide to sell, I think there are several people here (myself included) that would consider buying it and/or that could help you sell. And if you decide to keep, I think there are several people here that could give you recommendations for good property managers in the area.
Figure out what is best for your situation and then put the word out and we can assist.