Available for 300 yen each (~$2.72 US), each Chicken Slider is basically a soft flour tortilla filled with spicy taco meat (they don't mention what type of meat but it appears to be ground beef), special mayo sauce, and three cheeses (Gouda, cheddar, and mozzarella).
It's also available in a combo that also includes a biscuit and a drink for 500 yen (~$4.54 US).
Photo via KFC Japan.