So... is Platonic Chain finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: March 29, 2003
Manga finished: June 17, 2006
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
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Synopsis
In a technologically advanced near future, where constant connectivity is the norm, a dangerous website called Platonic Chain emerges.
This website, created by a mysterious hacker, promises users access to a vast amount of personal information, raising concerns about privacy and security.
The story follows three young girls, Hitomi, Rika, and Kanae, as they become entangled with the Platonic Chain website and its potential consequences.
Their lives are changed by the information they discover, and they must navigate the ethical and social dilemmas presented by this unprecedented access to data.