Yagura Katsudon is a local restaurant on the basement floor near Hakata in Fukuoka, serving katsudon, udon, and soba set meals. The open kitchen fries the tonkatsu to order, so the cooking is visible from the seats. On weekday lunchtimes, local office workers and solo diners fill the place, and a staff member speaks a little Korean. A line forms during lunch hours, and the wait can reach one hour.