The Korean Air lounge at Osaka Kansai (KIX) airport is located outside of security and is accessible via Priority Pass. Go down to the third floor, and look for the lounge sign near Uniqlo. Given that the lounge is located outside of security and immigration, make sure to leave plenty of time to get to your gate on time. On this visit, it took me about 30 minutes to get through security and immigration after leaving the lounge.
The Korean Air lounge offers some seating and some food (theoretically).
At breakfast, there were pastries, onigiri, instant soups, and instant noodles. But all of the food would disappear very quickly. As you can see from the below pictures, there was only one left of many of the items.
There’s also a meager assortment of beverages, but this lounge is really not worth a stop. It’s hard to find, the offerings are scant, and it’s located outside of security, so you can’t really relax until your flight.