Anniversary Memorial (Yahoo Japan Auctions)

[felineki]

This doujin set is up for auction now, with a starting bid of 10,000 yen, or a "buy it now" price of 15,000 yen. Like with most items on YHJ auctions, you'll need to work with a deputy service if you're outside Japan.

Violet's Library has some info on this set. It's also noted on her big list of doujins.