A restaurant can only be a chef, otherwise your friends can't recruit people from China under other excuses. In other words, what is the reason for recruitment, and what are the necessity and advantages of recruiting and hiring you from China? As a chef, a chef's certificate is a must. I don't know what the working experience of 10 years is, but one thing is certain, that is, a certain number of working years is very helpful for the success of visa application.
As for what kind of identity he can come to Japan, this man with lofty ideals has different views. Studying abroad, getting married and so on.
For reference only.