Mishima is a quickly expanding chain of Japanese donburi, soba and udon restaurants. I think they are up to 4 now. Donburi is a bowl of rice with stuff on top. Once they put the stuff on top the name is usually shortened to just don. For example Gyu Don (Beef Bowl), Niku Don (Meat Bowl, thicker beef), Una don (eel bowl, tastes kind of like tender BBQ chicken), Oyaku don (Chicken and egg bowl)