七海SAI

Height: 181 cm

Sai Nanami is the son of the owner of Nanami Conglomerate and the older brother of Ryusui Nanami. While he is a prodigy in mathematics and is said to be "a million times" better than the average person (according to Ryusui), Sai's passion lies in coding, and he claims himself to be a programmer rather than a mathematician.