Yoshinoya isn't bad, actually. I was surprised at what kind of game it was - I expected a "The Konbini"-style simulation type deal (well, at least I think that's what The Konbini is like, I've actually never played that either!), but it's more of a puzzle game than anything.
The gameplan is rather simple; a slew of customers will come into your restaurant, you will then have to welcome them, show them to a seat and take their order - one of four items, each corresponding to a button on the controller. If you don't take care of your customers quickly enough they will get mad, and in worst case simply leave the restaurant. Once you've gotten through the whole day you'll get a special customer who's a boss of sorts, and you have to go through some simple cooking minigames and prepare a meal to the customer's satisfaction. The gameplay mechanics on the whole are quite simplistic, but the challenge lies in keeping up with the hectic tempo of the game.
I haven't played it a whole lot, but it seemed like an OK game to me. Nothing I would sink huge amounts of time into, but a fun diversion for sure. If you can get it dirt cheap like I did, I'd say it's worth a look at least.
