One coin for lunch

It's a secret place to eat sushi lunch for only one coin(500yen) almost 6$.
It's because the simple sushi restaurant is owned by fish dealer who sells fresh fish next to the door.
I think it's very reasonable business to attract people and make happy.
Even more the restaurant opens until 3pm beside the almost of all the restaurants whose lunch time is over 2pm.
I can eat delicious sushi lunch much later around lunch time after a long time medical service of my patents at the general hospital.
They are also happy to have LATE LUNCH once a month.