Furukawa Sanae (古河早苗) was Nagisa's mother. She was very young looking, and often mistaken for Nagisa's older sister. Sanae and her husband Akio ran a bread store. She often tried to make her own original breads, but they turned out too strange and they never sold well. This always caused Sanae to cry.

Sanae likes to teach. When Fuuko wished that she could attend class in school, Tomoya set up a class setting, and Sanae became a teacher for one day. Sanae used to be a junior high school teacher, but she quit. Now she is teaching some kids in her own private class.

Sanae's voice is done by Inoue Kikuko (井上喜久子).