Hoshiko Mizudori is a student at Akademi High School, being the smallest member of the group of bullies, she attends classroom 1-1, unlike her classmates, she doesn't have a particular reason to be bad, she's just a person cruel that she likes the suffering of others and her own personal gratification, she does not care what others think, she is simply bad for the pleasure that this generates, however she pretends to be a positive girl, but when nobody see, she shows her true self.