The story centres around Hitoshi Koube, 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 ( The Japanese pronunciation of the English word "Thirty" )- 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.