Well, I haven't downloaded it (yet :embl: ), but it seems to be a combined demo (in the non-playable sense) and system benchmark for Yumeria, a 3DCG love adventure game for PlayStation 2 by Namco... I didn't realize there was a PC version, but my guess would be that it requires a pretty hefty 3D card to run, and Namco wanted to make sure that everyone could check their systems were powerful enough before buying the game since those kind of required specs (P3-500, DX9 card, etc) are rather unusual for a dating sim.
I'm downloading it now - I'll post a proper description later, once I've had a chance to check it out.
[edit] Hmm, well, it seems to serve two functions - the "demo" mode plays (non-interactively) a few scenes from the game, with voice, etc in a loop (this may well be designed for running on a
90shop demo machine), showing off the character interaction bits. There aren't any shots of the battle sequences or anything, sadly.
The "benchmark" mode runs a subset of the "demo" mode sequences (namely, the bits where the girls show off their swimsuits ^___^) repeatedly, and clocks up a score based on how long it takes. Not exactly scientific, but highly entertaining nonetheless
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"...And when I finally meet you again, I want to ask you - have you found what you were looking for? Because that's what I felt you were doing, all these years. And I want to hear you answer, "Yes, I have, thank you for asking," and we'll be together again, until the end of our days..."