Haruna Sakurada
Haruna teaches one of the second year classes at Crossroads Junior High. Umino, Naru, Ami, and Usagi are her students. Later in the year Ann joined her class as well.
Haruna has a big temper, and wasn't that happy of becoming a teacher. So she tends to take a lot of her anger out on her students, especially Usagi. But Usagi still goofs off, by sleeping or eating during the class.
Haruna loves going on dates, she loves them so much that she would consider not being a teacher. She has even left the students by themselves so she could go on a date.
Haruna Sakurada later on dissappears from the main image, probably because the 4 students graduate from her class, and hardly see her anymore. They do show Haruna a few times when the characters are out shopping.