The original Silver Case website, ran by Sagara Nobuhiko, contained a number of editorials, character profiles, Q&A and other interesting content related to the world of The Silver Case.
The website unfortunately does not exist anymore but it has been archived on the wayback machine. I personally find it quite hard to navigate since some of the layout is broken and most of the images are missing; Therefore I compiled all the relevant content right here.
Silver Maniax Part 1: A list of all the words that are passing in the background during the Transmitter chapters.
Silver Maniax Part 2: All the song titles that are shown at the end of each chapter.
Silver Maniax Part 3: The Mother Goose rhymes referenced in the third placebo chapter.
Timeline of the 24th Ward (this was updated and translated for the new website)
While not as rich in content as the original website from the early 2000s, the modern day rendition of The Silver Case’s webpage still includes some interesting content; namely, a replica of the Kamuinet website from the Kamuidrome chapter, and a timeline of the 24th ward which in itself is an updated and translated version of the old one.
You can visit the official website here.
Here’s a link to an archived version in case the original ever goes down.