From Sega Retro
The Sega Flash series was the official brand of European Sega Saturn demo discs. They were produced by Sega, and similar to the Sega Dreamcast's DreamOn series, were both bundled with new Saturn consoles and provided through the officially branded Sega Saturn Magazine. The discs typically contain a couple of game demos and a few trailers of upcoming games.
Only seven volumes were produced, and many demos/movies were recycled: