Yuzuki Fujimura

Yuzuki is the twenty-five-year-old homeroom teacher of of Sana's class; Syusuke, Nanaka, and Syuri are also in the same class. Whenever her students do a good job in school, such as cleaning a classroom thoroughly or bringing things to the teacher's lounge, Yuzuki will give them a piece of caramel candy, and even though she says to keep it a secret, everyone already knows that she does this - Wikipedia