Kagerou Days (Vocaloid song project.)
Kagerou Days (Or Heat-Haze Days) is a Vocaloid song series that has spawned 2 albums, a novel, a manga, and now an anime series. It is done by Vocaloid composer Jin.
The reason why I'm posting this is because it's the first Vocaloid song to get an anime and a novel. I don't see the reason why it shouldn't get an anime, every song has a story to it and it's all very complex.
Most of Jin's Kagerou Days songs have been translated and put on Youtube. (I'll link the translated songs in the next post!)