Isshiki Yuki

The area manager dispatched to oversee the manager's operations after the rash of shoplifting incidents in his premises. If he fails to reach one of the game's endings before the end of the month, she removes the franchising contract from him and a replacement store manager is assigned.

She helps players through the game's prologue which serves as a tutorial for the game's simulation component.

Spoiler

It is implied she is related to the school governor where Mei's brother committes suicide and may have had a hand in the cover-up operation.