Daikuuji Ayu

Japanese name:	大空寺 あゆ
Nickname:	AyuAyu

Ayu is the surly daughter of the chief executive officer of the "Sky Temple" financial group, who owns and operates the restaurant chain. As such, she is permitted to work at the restaurant as part of a market study by the financial group on the condition she does not reveal her identity. She works in order to experience society.

Wikipedia