In the near future, technology has advanced significantly with videophones and constant wireless internet available to all individuals. Despite this progress, it appears that the government has been negligent, allowing a skilled hacker to breach the national information archive. Utilizing the data stored there, the hacker creates the Platonic Chain website for people to discover personal information about themselves and their friends. News of such a site spreads rapidly, leading individuals to search for any available information on it. Meanwhile, three young girls - Hitomi, Rika, and Kanae - are fortunate enough to access this platform.