Nanako Yamamoto  

Nana, 山本菜々子

Yamamoto-sensei is a female teacher who oversees the class next to Tsuchida's. At first sight, Tsuchida became infatuated with her. Despite this, she does not comprehend that men typically develop romantic feelings towards women. She instructs the students of Peach Class and has demonstrated proficiency in sewing by repairing Tsuchidas apron and Koumes stuffed panda-cat dolls ear.