Natsumi Bekki
Homeroom teacher of 2-A class. Although young-looking, she likes tricking her students and is cheerful. She is something along the lines of 40-years-old and has never been in a relationship. She has frequent mood swings; she is a bright cheerful woman at one point where she openly tells her student the perverted things she has done to herself, and then she is gloomy next when she feels the weight of being single and lonely. She is also an otaku. Her students often call her "Around Forty," however, when she is angry she becomes the feared "Gaia."