Mitsuki Katou is a student of Naraka High School and a member of Class 1 who tries to be as uninvolved in their group's activities as much as possible, but still ends up getting dragged in a lot. Mitsuki Katou has black hair and eyes. He ties up a section of his hair in a high ponytail and wears the standard Naraka High School uniform. His character is located on the left side of his waist.