What is your favorite part of the soundtrack? Mine is definitely BGM_020, the one which plays when you can see the faceless girls (I don't remember if or how's the area named, sorry).
BGM_006, which I think is Mars-san's area.BGM_010, Ending theme.BGM_017, The Barracks.BGM_018, The room you get the flute in.BGM_024, The checkered area.[FC] BGM_001, FC World.ゆめにっき(Yume Nikki), the song that plays while saving.Also, this and the songs in it:http://www.youtube.com/watch?v=JKOa9GPAyyA
BGM_006, which I think is Mars-san's area.BGM_010, Ending theme.BGM_017, The Barracks.BGM_018, The room you get the flute in.BGM_024, The checkered area.[FC] BGM_001, FC World.ゆめにっき(Yume Nikki), the song that plays while saving.
Also, this and the songs in it:http://www.youtube.com/watch?v=JKOa9GPAyyA