I saw that auction. . . Last year there were some 
beautiful Ah My Goddess cels for auction (on Yahoo
Japan) that were from a video game. This looks 
like another one of those. The quality of the art 
is the same as the ones I saw before, and it's 
obviously not from either the OVA or the movie.

But keep in mind, I have not played this game, so 
I don't know for certain.

Many Sharp Smiles,
--Drac