Shintani Nafumi

She had a lot of chances to make passes at men, but because her preferences are so specific, she doesn't have a boyfriend. She is a paedophile that finds pleasure in making young boys model for her and drawing pictures of them. More specifically, she enjoys harming young boys and drawing their agonised expressions. When Yuuki rejected her requests, she became enraged and pushed him into a desk, unwittingly causing a heavy bust to fall off and hit Yuuki's head, killing him.

She's become a prime example of a perverted teacher. Normally, she's very kind, but behind closed doors she's rather violent. Right now, she's running a never-ending marathon through Escher's "Ascending and Descending".