Nothing fancy, same black micro we've seen a bunch of times before. Not sure where this set came from, I don't see it as an item on Fantia. Presumably a bonus of some sort.
She pretty much always wears pasties, but some of the Nazuna pics in the Junk set are a bit nipply. Maybe it was just really cold, or she went without that time?
Found the Imitation Gal video from Fantia. Unfortunately it's the "fully dressed" version instead of either of the swimsuits. Probably couldn't do the sling suit due to how many times you can see the nipple pasties or the editing to hide them in the static images.