In the near future, technology has made significant strides, making videophones and constant wireless internet access available to everyone. However, it appears that the government has been careless, allowing a skilled hacker to break into the national information archive. Using the data held there, he creates the Platonic Chain website, enabling people to discover information about themselves and their friends. Word spreads quickly about a site that allows you to look up anything. Coincidentally, three young girls—Hitomi, Rika, and Kanae—are able to access the site.