Nakae Wakabayashi

Childhood friend of Takenomaru who protected him and acted as his only friend. She came from their hometown to live and work in the city. She ends up working at Takenomaru039s and Mr. Sagami039s house as a maid. Even after not seeing each other in seven years Nakae calls Takenomaru with the childish nick name quotTakechanquot and acts as if she was his older sister Source:Wikipedia