this is a doujin game: http://eslaf.main.jp/index.php

quite obscure, i know

has someone, by impossible, ripped its soundtrack?

Well, the game is actually free, so I suppose after installing you will get a folder with these files:
http://www45.atwiki.jp/feil/pages/59.html

And that, in fact, is the soundtrack.

True!
Thanks a lot
A temp link with the folder as little gift: http://www.megafileupload.com/60d9/e_s_laf_music.rar