Who is Kosaka Sensei?
Ms. Kosaka is a Hoken no Sensei (health room teacher). Technically, she is not a doctor, nor a teacher. She takes care of the sick and injured at the school health room. A Hoken no Sensei also often works as a counselor for troubled students. Shizuku seems to have a special relationship with Ms. Kosaka since she and her friends eat lunch in the health room (usually, Japanese students eat their lunch in their class room).
