It’s an album released by MintJam at C67.
Suprised for the fact that despite the album title:
ATMOSPHERE -Poteneko Academy- ~ Original Sound Track.
which make it sounds like game’s sound track or something. It is not.
This album is a sound track for doujin series (mostly comics and art books)
made by Ice & Choco, A doujin circle by Naru Nanao. Surprise~
So here is what I’m doing right now, while listening to this album,
browsing Ice & Choco work’s list here.
More info on Poteneko Academy here.