It's [Bingo Tart] Pretty Pridot (according to dlsite.com)
Part1 Pretty Pridot: Introduction Edition
Part2 Pretty Pridot: Main Edition Part 1
Part3 Pretty Pridot: Main Edition Part 2
These are flash conversions of videos of a better quality. There is a thread on /r/ currently about it with a link to a torrent for the 3rd part, but I will post a fileshare when I find all three parts.
You an also buy it at http://www.dlsite.com/ecchi-eng/work/=/product_id/RE085194.html
if you're impatient.