The first thing is to look at your store and the configuration of your store staff.

You can see that he has 0 favorability since entering the store, and then it increases once he sits down. This is in line with the size of your store. Then the second increase is when the waiter provides menus and drinks. This is related to the various values ????of the employees who provide services. The third time is when you eat. This is much more important than the first two times. Specifically The way to do this is to entertain him with a high-end dish. Note that as long as the high-end dishes here have three attributes with a score of B or above (in principle, three Cs are also acceptable), you can easily achieve a favorability of more than 80. That's it. I wish the game Happy.