I saw an actual Pizza Hut just last week and I was tempted to go although when we passed by it it was because we needed to go to Hiroshima (About 4 hours away) for some government business. So we didn't have time to make a lunch trip. Although I hear that Pizza Hut here is the same as every other pizza place here. Toppings always include Mayo, seaweed or corn niblets.
What can I say. The Japanese love mayonnaise.