These CDs were distributed to stores at the very beginning of the Playstation era (from December 1994 to Sepember 1996). They contain playable demos as well as promotional movies and bonuses. They were only run inside stores for the clients to test games and watch clips.
They are very rare, it took me a lot of time to collect them all. I'm proud to be the first in Occident to post the full set. There are 23 volumes (22 + a Special CD).