Significant technological advancements have facilitated widespread availability of videophones and constant wireless internet. However, due to government negligence, a highly skilled hacker was able to breach the national information archive. Resultantly, the hacker launched Platonic Chain, a website enabling access to personal information of oneself and friends. This ground-breaking website swiftly gained recognition, and three young girls, Hitomi, Rika, and Kanae coincidentally succeeded in gaining admission.