からくり卍ばーすと (Karakuri卍Burst)

Also known as "からくり卍バースト", or "Karakuri卍Burst", this is a duet sung by Kagamine Rin and Len, specifically their Append POWER voicebanks. It was created by (insert uploader name here for future reference).

Although Hatsune Miku makes an appearance in the song, she does not actually sing in it, although a few covers by Miku have been uploaded here and there.

The Song
Story

The video opens with the opening credits (many credits are posted at the end of a work. This may be related). Rin is shown standing beneath the moon, as if to approach. Len is shown standing before hundreds of dead bodies. It isn't revealed who the apparent victms are.

Rin begins the song by singing about how she's visiting a sleepless town. Rin wonders if she can control her "blood-stained desires". Then, Rin asks somebody if they would like to "test the frenzy of the blade hidden in my sleeve." Then, Rin pulls out a gun, and remarks that her fingers, once she pulls the trigger, also become stained in a brilliant red.

Next, Rin sings about her desire to destroy. She says that humans are "worthless, brittle, and fragile", and that "they are, after all, merely discarded puppets". Finally, Rin asks why she was born, and for Len to tell her the answer.

Then, Len enters the song and sings about how there are no such things as coincidences. Len says that "everything, from the very beginning, has already been labeled from a black-and-white perspective." Len sings about how sinners are chased out and destroyed at his orders.

Len sings about his own desire to destroy. Len says that he'll destroy everything, and that he wants all sin to "die, die, die!!" He says that "all sinners are, after all, worthless pieces of scum". Then, Len asks Rin why she was born, and that he'll tell her the answer.