Itoshi Sae teaches physics in St. Mary Gakuen Tokyo, mostly just to pass time. He is hard-to-please and often disinterested in most things, but takes whatever he does seriously. He may not ‘like’ teaching, but he does it damn well. He is strict and unbiased when he teaches, taking time to memorize all the students he teaches’ names. He is described by students as distractingly handsome, but does not care about his looks. Many students are scared of him and call him a killer teacher.