The Silver Case Deluxe Edition contains the following:

The Silver Case HD remastered game.

Artbook
Original and revised artworks drawn by Takashi Miyamoto combined into one exclusive artbook!

Comic
The hidden story between Moonlight Syndrome and The Silver Case, "Pre-Lunatics".

OST
A total of 34 tracks in mp3 and FLAC formats from the game including the OP remix.