Yoshino Kuro

Yoshino Kuro, better known as "Moringa" or by her given nickname by the student body "Shikaku" (刺客, "Assassin"). She is feared all over Seta Girls' Academy for her cruelty, sadism and highly brutal punishment methods. She will commonly give her students tasks which they cannot complete only to accuse them of slacking when they inevitably fail; the tasks are always close enough to the subject at hand so as to not seem suspicious, but are invariably always just a couple of steps beyond the students capability range. She also gives a couple of students the answers in order to make the failure feel much more significant - talk with parents are also very common; which she does to instigate worry in the students Guardians in order to further contamine their life even in they're not in school.