In a conflict Isawa Kaede is atacking with the Fire ring, and that ring gains Void, you play Kami Unleashed and use the ability to resolve the ring efect. Kami Unleashed resolve both Fire and Void, only Fire or can chose what efect resolve?

From Isawa Kaede's page on fiveringsdb, you choose between Fire and Void:

Quote

If you use Guardian Kami or Kami Unleashed while Isawa Kaede is attacking, you only get to resolve one ring effect (of your choice). Kaede did not actually win this conflict, so her "resolve all ring effects" ability does not apply.

Developer ruling

Ok, thanks!