" Other than chicken and rice, you'll find Tokyo restaurants specializing in fried pork cutlets, curry rice, ramen, udon, soba, gyōza, beef tongue, tempura, takoyaki, yakitori, Korean-style grilled beef, sushi, okonomiyaki, mixed rice dishes, fried chicken, and dozens of other dishes. Furthermore, even if you know something about Japanese food, it's common to come across a restaurant whose menu or plastic food display indicates that it specializes in a particular food you've never seen before and can't quite decipher.
Out of this tradition of single-purpose restaurants, Japan has created homegrown fast-food chains. McDonald's and KFC exist in Tokyo but are outnumbered by Japanese chains like Yoshinoya (beef-and-rice bowl), CoCo Ichiban (curry rice), Hanamaru Udon, Gindaco (takoyaki), Lotteria (burgers), Tenya (tempura), Freshness Burger, Ringer Hut (Nagasaki-style noodles), and Mister Donut (pizza) (just kidding). Since the Japanese are generally slim and healthy and I don't know how to read a Japanese newspaper, it was unclear to me whether Japan's fast-food chains are blamed for every social ill, but it seems like it would be hard to pin a high suicide rate on Mister Donut. "

― Matthew Amster-Burton , Pretty Good Number One: An American Family Eats Tokyo