It is the year 2026 in the mysterious city of Daikoku.

Okonogi Yasako is a 6th grader in elementary school. The Kokonogi family, which includes Yasako, her little sister, and their parents, are a typical family. They move to Daikoku where Yasako's grandmother lives. It is a historic city with many shrines and temples. Daikoku is also a special political district that has the latest computer facilities.