Shakey's is a pizza parlor that came to Japan from the US in 1973. They provided all-you-can-eat pizza when it was still a rare dish to serve and contributed to the growing popularity of pizza in Japan.
It's usually filled with families and young couples who come here to eat the various pizza they serve. They even have dessert pizzas. Ironically, I don't come here often but when I do, I tend to always go back for their fried potatoes. So good!