Steamer Fairy. AKA Seiro-Fair (Chinese style steamers are called "Seiro" in Japanese. )
They are the hidden sous-chef of this restaurant. Without them, dumplings at Pankichi-Ken cannot be as good as they are.
Steamer Fairies are very elusive and difficult to catch. Even a glimpse.
They are everywhere, at the same time, they are nowhere.
If you are lucky, you may be able to see them, some day.
On the other hand, they might be watching you from somewhere without you realising it. Beware of Steamer Fairies!
But don't worry, they are very good at keeping your secrets.