Shakey's pizza is part of a nationwide chain. Shakey's offers an "all-you-can-eat" buffet with pizza, pasta and fried potatoes, plus an optional salad bar which costs a bit more.
Shakey's Pizza, along with the other restaurants in AiAi Mall, is now sadly closed.
More About the Restaurant
Apart being originally from the US, it should be noted that the pizza is quite different. They have many traditional Japanese pizzas with corn and tuna toppings. They also have curry and rice on occasions and the salad bar is not always available. Lunch is around 1000 yen with a drink. -Martin
The all-you-can-eat pizza lunch buffet costs about 1000 yen. Check the selection before you decide to go for it, though.