Seemingly innocent and deeply concerned for her students' grades, she offers private lessons to anyone willing, though at a price. In the dark recesses of her chambers, she becomes a lamia, with the head and torso of a beautiful woman, but the body of a serpent, and uses her abilities to drain students' emotions in exchange for knowledge; she does this through a flower-like appendage on her tail. She also seems to have a fetish for S&M outfits. Ririko is only lascivious to males, while any girls that need lessons are made to dress up in maid outfits and serve her tea. It is important to note that unlike other antagonists, Ririko is not inherently evil, but rather very passionate about the education of the academy's students.