Rei Saiga is a supporting character in the anime and manga series Shangri-La Frontier. She is a close friend and classmate of Sunraku, the protagonist. Rei is highly intelligent, resourceful, and deeply interested in gaming, particularly in the virtual world of Shangri-La Frontier. She often provides Sunraku with valuable information and strategies, acting as a supportive figure throughout his journey. Rei's analytical skills and calm demeanor make her a reliable companion, and her presence adds depth to the story’s exploration of online gaming culture.