Sai Nanami is the son of the owner of Nanami Conglomerate and the older brother of Ryusui Nanami. He does not like to reveal the background of his family, not anything about his family. He is a mathematical prodigy and is said to be "a million times" better than the average person. He is currently a professor at a university in India and a programmer. He is originally from Japan. He is Indian-Japanese. He is 5'11 ft in height.