Yū Kojō conducts undercover inspections for the Sparrow's Hotel Group, assessing standards like cleanliness and staff conduct. Her attempts at secrecy consistently fail, as the hotel staff swiftly uncover her true identity and purpose, compromised by telltale mannerisms during guest and employee interactions that betray her role as an inspector. Despite this notorious inability to maintain a covert presence, she later secures a permanent position as an employee at Sparrow's Hotel.

She possesses distinctive shoulder-length red hair accented by a hairclip and pink eyes. Her professional role is reflected in her consistent depiction wearing a suit.