This is kind of depressing, when I think more about it.

Reminds me much of the Miku song Can't I Even Dream?.Actually, it even matches up to it, considering the song seems to be about wanting something or someone they can't have (my interpretation of the lyrics), however, they wish they could be loved or to have what they want, becoming sad when they realize, in some way, that their dreams were just dreams, much like how Nui, in this grouping, would like someone and is sad (in some way), along with being troubled by the dreams and feelings she has.