For people saying about these CGs being reused, G.J. (The company that Sano works for) actually sells a "VN maker" software, and the license includes allowing all his art CG being used this way, the software kit even come with a simple VN game engine as well as some of the soundtracks.
Here's the link to the product in question: http://www.teck.co.jp/gj/products/sano/index.html
The kit is quite good, the art assets even comes with characters on a transparent background so you can layer it onto whatever background you want etc. The idea is so scenario/writers that have zero artistic skills can still create VN or CG sets without hiring/collaborating with an artist.