|Occupation||Hiiragi Academy Principal|
|Relatives||Koyomi Hiiragi (cousin)|
|Manga Debut||Chapter 48 (silhouette)|
Arisu Hiiragi is the principal of Hiiragi Academy, the head of the main campus, and Koyomi's cousin. She runs the main campus as a prison, and has been given the nickname of "Brioche-Rolls."
The principal of Hiiragi Academy, Koyomi’s cousin, and the head of the main campus. Her ideal of education is to strip all aspects that make a school sound attractive; a “prison-like” school that has no meaning of the word fun, and has the students suffer through discipline and agony to the point where only those who have withstood the torture can go on to live excellent lives under the Hiiragi family.
She first meets Junichirou in his classroom to discipline him for being the cause of Reiko running away from the main campus. Despite Reiko deciding to return, Arisu states that she will not allow her to find her way following Junichirou’s ideal of an interesting life at her campus. Junichirou retaliates however, and challenges Arisu to a game with his status as an otaku on the line by having Reiko play against Nami in basketball.
Arisu ends up losing the duel, and takes her anger out on Nami, particularly when the former starts to defy her academy ideals; taking from her almost all the points Nami’s obtained over the years, and demoting her to rank E. The result is Junichirou challenging her for the principal seat of Hiiragi Academy, much to her chagrin, as she is then forced by Koyomi to take part in the SS group war between Junichirou’s Silver Core and the students from her campus. Since then, she watches from afar as her main campus students battle it out against those who follow Junichirou.
48, 49, 73, 74, 75, 76, 77, 78, 79, 81, 87, 89, 90*, 93, 98, 104