Paradise Hotel 51

Where Gaming Dies

探偵 神宮寺三郎 Innocent Black crossover

The Silver Case had a crossover with the Detective Jinguji Saburo series, known in the west as “Jake Hunter”, specifically with the 2002 Playstation 2 release Innocent Black.
From what I could find in this mixi thread and in these 5ch threads, Tetsugoro Kusabi appears as a phone contact in the game, and it’s possible that Kusabi will gift Saburo a bottle of “Silver Blitz” sake. Also, by inputting the password SLVR in the title screen, a scene will play out in which Saburo interacts with Tokio Morishima.

Translation by Jolovey
MAGNIFICENT CITY
MAGNIFICENT SYSTEM
MAGNIFICENT GOVERNMENT
MAGNIFICENT MUNICIPALITY
MAGNIFICENT LIFE
MAGNIFICENT EDUCATION
MAGNIFICENT FUTURE
MAGNIFICENT PRESENT
MAGNIFICENT PAST
MAGNIFICENT DAYS
MAGNIFICENT PEOPLE
MAGNIFICENT I AM

Unfortunately the game (and most of the Jinguji Saburo series) is only available in Japanese, so I’m not yet clear on the details.