Sensei is never named, though she is a teacher from Zashono Academy, she often laments the fact she always seems to go unnoticed by her students and peers, not to mention the fact that they never seem to remember her name. She has bright green hair and an 85cm (C-cup) bust. Her running gimmick is that Chiharu always stumbles upon her and Densuke in compromising positions, each time requiring Densuke to spend more time allaying her fears (from a week to a hundred days). She likes spanking herself.