A biology teacher at Kotaro's high school, she is affectionately referred to as Tomo-chan, much to her disliking. Her favorite hobby is the study of the supernatural, which tends to get her classes off subject. She also enjoys making a hard time for Kotaro and his friend Takeshi. Short of stature and usually dressed in a white lab coat, thick glasses, and a messy hairstyle, she appears unattractive on the outside. But with a little makeup she can be a real beauty. Because of her knowledge of paranormal phenomena, Kotaro goes to her as a source of advice on time travel.