I came across this series of songs a while ago. So far there are only 6 different songs that are linked, but they're all connected in their own ways.

Pride: My absolute favorite series of the songs has been The Story of Evil, which is a part of the series of the sins, showing as pride through Rin and Len Kagamine. I personally believe that the pride aspect shows in both of them, Rin for ruling as she did, and wanting the blue prince that fell for the green maiden, and in Len, for switching places with Rin to keep her safe.

(http://www.furaffinity.net/journal/1641285/ Old journal that has the Story of Evil songs.)

Gluttony: Conchita, the Epicurean Daughter of Evil, Mekio. The embodiment of gluttony defined. A woman that used to go around looking for the best foods, but then sought out the most horrid and vile meals that can be made. But even that wasn't enough, and then she ate her servants in the mansion, and maybe others in her area...and then she devours herself. o_o;;



Lust: The Madness of Duke Venemonia, Gakupo Kamui. Through gaining a strange ability to entrance any woman that sees him, he has a harem of women from many places and...well the video may explain better than I can. =w=



Envy: The Tailor Shop on Enbizaka, Luka Megurine. The tragic tale of a tailor that wanted a husband, and believed she had one, but thought he was "unfaithful" to her, even though he had a wife and two daughters, which the tailor killed and took certain things from each.



Sloth: The Princess who brings Sleep: Hatsune Miku. A sad tale of a young girl forced into a political marriage, but loves who she's with, even though the husband's a manwhore and liar. So she gives him a potion to help him sleep, but it's not your average everyday sleeping aid...



And finally a song I think has two of the sins at once. The Judgement of Corruption, Kaito as Greed, and Gumi possibly, as Wrath. Kaito plays the part of a judge, wanting money as a bribe to pass false judgement and find even the most vile and evil person innocent. After a trial gone wrong, and many people burning his home down, he finds himself in hell, where a "master of the Hellish yard," that looks like Gumi, offers him a choice to give up his fortune and achieve salvation, or refuse to and suffer.



And there is a song before each of these, that seems to explain how the sins came to be. The Chrono Story.



Definitely an interesting series, and each has a decent message I think. Tell me what you all think. ^^