Saati was an artificial intelligence program designed for talking to girls, and is the thirtieth A.I. program Hitoshi created, and the first program that Hitoshi really liked.

Through a freak lightning accident she is transferred to the real world, and becomes Hitoshi's live-in girlfriend. In the real world she takes the family name "Namba" (難波, "Namba"?), which is properly pronounced nanpa ("whirlpool"). In Japanese naming order her name, Namba Saati, is based on the Engrish pronunciation of "Number Thirty" (Nanbā Sāti).

A kind girl, size data 82-58-85 cm (32¾"-23"-34") with thick eyebrows (A trait Akamatsu admitted to liking on women, citing Sae Isshiki as an example), and a bit naive, which does lead to frequent problems with Hitoshi. The most notable of which is that when she cooks meals she has the tendency to make them look exactly like the picture, regardless of the taste (having no taste buds), using everything from paint to colored markers until she receives a program upgrade that allows her to taste.

Hitoshi based her appearance on his mother.