Kazuha works as the school's librarian. When Kono was looking for a erotic novel, it was revealed that she is not only very sexual but is secretly a submissive masochist who's into S&M. In fact she wears a vibrator all day during work and a leather sex outfit underneath her conservative clothes. She also writes erotic S&M novels under the pen name Reiko Akutagawa.
She and Takeshi share a similiar love for erotic novels. Kazuha acts as his submissive whose dominated by Takeshi wehn they have sex. She also sometimes calls him master.