Rio's childhood friend who had been recruited by Tom Howard as a dealer. Her mother was hospitalized and her father was frequently away on business trips when she was a child, and therefore was raised by Risa and Rio, the latter whom she had a sibling-like relationship. She has a mysterious energy that makes her customers weary, as opposed to Rio's aura which gives her customers energy. It is later revealed that she is Rio's half-sister and a Gate Holder working under Cartia, who is revealed to be her aunt. She seeks revenge on Rio and her mother, Risa Rollins, who allegedly eloped with her father, causing Rina's mother, Ilina, to fall into a coma.
Source from Wikipeida