The story centres around Hitoshi Kōbe, a guy who is neither academically gifted nor good at sports, so he does not do very well at school.
Hitoshi has only one thing going for him - his ability to program computers. In fact, he is so good at this he has created programs that can rewrite themselves Artificial Intelligence , in other words. So far he has created thirty of these programs, and the latest - whom he names Saati is so advanced that conversation with her is indistinguishable from a normal girl and, thus, would easily pass the turing test.
However, there is still the barrier of Hitoshi being in the physical world and Saati being a program, until one day a freak lightning strike materializes her into the real world, where she becomes the girlfriend of Hitoshi.
The series then follows their now not so ordinary lives, as well as other A.I.s of Hitoshi's creation.