Homeroom teacher

The homeroom teacher of Class 2-A in Sanada North High handles their Japanese language studies. She is well-acquainted with her students' capacity for mischief and is easily annoyed, but is also a prankster in her own right.

Appearance
The homeroom teacher is slim and of average height, with dark brown hair in a ponytail. She is usually seen wearing a maroon jacket with a light skirt, and shoes with dark socks.

Personality
She is introduced as someone who doesn't mind having a bit of harmless fun at her students' expense. She also seems to be earnest about her job and gets annoyed easily when her students don't take official things seriously.

High School Boys and the New Term
The discussion among the group of four ends when they hear her footsteps. The teacher walks into class and greets her students. Turning to the board, she begins to write on it and tells them there was something about which she'd tried and failed to contact them. She turns back to reveal a message on the board, which reads that it was still winter break and that school would start only the next day.

The teacher runs out of class laughing, while the furious boys give chase. The end scene shows her escaping from them by hiding behind a wall.

High School Boys and Love Letters
After Yoshitake and co. decide to get back at the prankster, the homeroom teacher overhears them and wonders why they don't consider the possibility that it's a real love letter. She also hopes they don't cause any trouble.

(Anime-only) High School Boys and...
She makes a cameo at the graduation ceremony, where she's shown seated with the other teachers.

Trivia

 * She placed 34th in the character popularity poll, with 252 votes.