Hasebe Rumi

A kind, caring, and recently-hired art teacher

She is the protagonist's homeroom teacher.

She has a bright and friendly personality, and is very popular among the students as she is always willing to give advice to troubled students. She also has an outstanding figure. She is suspicious of Satsuki and the others' actions, and while she is at odds with them, she is also investigating the matter. As a result, she is somewhat shunned by the other teachers, who are determined to stay out of the way of the matter.

[Translated from Official Site