Hmm, I think the song I’ve spent the most time listening to lately would be the Nerine-specific ending song from Shuffle (the name escaped me at the moment). Another one I like a lot is ??? from one of the endings in Edelweiss, although it’s a bit more upbeat than the songs I usually like from eroges. I’m rather inexperienced with the Japanese selection of games though, so I can’t really think of any that haven’t gotten translated.
I guess ?2??? from Da Capo is pretty nice, but I’m not sure I’d go so far as to call it one of my favorites, but then again I have rather few to begin with so I might as well add it. I do kinda like Lovable Pup from D.C. too, but I’m not sure how long I’d be able to listen to it like regular music before it’d drive me crazy.
Oh, and the opening from Wind - A Breath of Heart. And the ending from ???, I quite like that one. Sorry, don’t know the names of the songs
Hmm, come to think of it I’m not sure if I like the songs for their musical qualities alone or because I enjoyed the games they came from. Maybe a bit of both. Probably is since I like a lot of video game music that probably isn’t all that great on its own, but has a certain meaning for me after playing the games they belong to.