A third-year student at Reimei Academy. Although he has a bright and cheerful demeanor, he is selfish and doesn't have much interest in talking about others. Born with royal ancestry, he recognizes others as people below himself. He is a member of the units "Eve" and "Eden", and the leader of "Eve".

While flippant and eager to remind others of his superiority, he possesses a soft spot for most others and has a habit of picking up those he finds as being unfortunate, such as Jun and their dog, Bloody Mary. He still considers those from the old fine to be his friends, and is willing to put time into helping others, even if he has to change his schedule, if they really need help. Due to his older brother succeeding as the heir in his family, Hiyori tends to be more laid-back in regards to his family's business.

(Source: Ensemble Stars! Wiki)