I recently went to a restaurant by the name of Yamato II. After being surprised by the fact that it was in fact a buffet, we paid the flat fee (which after tip came to about $40).
You are brought a menu, on which you can tally how much you want of anything, from steaks, ramen, sushi, and drinks. We ordered tons of sushi, some fried rice, and ramen, and to our surprise we got a handcrafted plate of sushi, an entire bowl of ramen, and two full plates of fried rice. The food was seriously good and authentic, too. It’s no wonder that they have a “finish everything” policy (where you are charged extra if you don’t finish everything).