Rio is the CEO's assistant. Cold and calculating, he cares more about objective facts than emotions.
Rio's appearance is dressed all in black, black hair, red eyes, large chest, wearing long black stockings.
Rio has always been unsociable and rather scrupulous. She never lets emotions change her mind and always sticks to the facts. Because of this, a lot of students find Rio to be terrifying, but Rio doesn't let their opinions into her head. Rio always scolds his CEO's attitude