A demanding math teacher who does not forgive his students for unfulfilled homework, is quick-tempered, rude, harsh, evil, affectionate, kind and fair. Sanemi Shinazugawa has ash-colored hair of medium length. They are always in disarray and stick out in different directions. The front strands are longer and fall on the forehead. Sanemi has almond shaped eyes. At the same time, the iris is purple, but very dark, almost black. His entire body is covered with scars and scars.