In American restaurants a waitress is independent. However, in a Japanese restaurant we are a team. Therefore, all tips are shared and calculated according to experience. There were no questions to be asked. For the Japanese menu, there was no price listed for sashimi.
Customers order sashimi for two or four, depending on the number of people.
The bills are elegantly paid with major credit cards which are company accounts. For the waitresses who depend on tips as a major income, however, it is a big deal. So there are always games of checking the tip before Okamisan notices. Soon I was accepted at the UN to work for the library. It was time for me to move on.