A successful fashion designer and member of the Keisaiin fashion family dynasty. His family is responsible for the "KeiSai:In" fashion line, and he launched his own specialty "rYUKI" line of clothing. 

His older sister, who successfully found love thanks to Cupid Corp, signed him up without telling him. His desire for marriage is extremely low, while his standard of physical beauty is impossibly high. He seems incapable of recognizing anyone with a lower facial rank, and has had trouble communicating with his various advisors in the past, leading to his inclusion in the Parasite 5.

He also has synesthesia, which means he sometimes associates people with specific colors, and he often replies to them with what is apparently their color-related hexadecimal code. In addition, he always carries a bottle of moisturizing mist with him to protect him from dry skin.