Menchi's Lament.
PezCat
Actually, I get quite depressed when I hear that song.
I mean, its depressing. I hate seeing Menchi sad. Menchi is awesome.....
for dinner.
The most disgustingly cute anime song I have ever hear is a tie between Happy Cosmos for DearS (I wanted to gouge my eyes out two minutes in) and Neko Mimi Mode from Tsukuyomi Moon Phase (I wanted to gouge a friends eyes out two minutes in).
I think Gendou's Anime Music has both of those to listen to, aswell.