The AI acting manager of the Gingarou Hotel, carrying out the duties of the original manager ever since humanity's evacuation of Earth. She is extremely diligent and hardworking, always ensuring that every task involving the hotel's maintenance is completed to the best of her and her robot workforce's ability. She is polite and welcoming to every guest that the hotel recieves, and always tries to accommodate their needs regardless of how unique they are. However, she is also not afraid to challenge a guest if she deems their behavior to be inappropriate or disruptive. Yachiyo cares deeply for the hotel, its workers and its guests, and still hopes for humanity to return to Earth regardless of how long she has already waited.
