A a series of multiple songs. The songs mainly feature Hatsune Miku, although Kagamine Rin, Kagamine Len, and KAITO make an appearance in the song Dark Woods Circus. This series has a novel adaptation that was released on July 27.
The songs tell of a Diva named Anna and her insanity, when being shipped to an asylum and then sent to a circus, where eventually she commits suicide, is sent to hell, and finally spends the rest of eternity as the Grim Reaper.
The Songs
Amendments may have been made to the original translation.
Note: This song is know as "Steel Cage Princess" in western fandom, but "Steel Queen, Caged Princess" is more suitable. This tradition comes from SakeBliss's mistranslated title.
The first song in the series. The literal translation is Steel Queen, Caged Princess. The song is about Anna (Miku) being held captive and being put in a "cage" by a "Queen" in a "castle." It is revealed that Anna was actually going insane, and the insanity is locking up her sanity in a "cage".
The second and most well known song in the series. In this song, Anna and others are in a circus where they are ridiculed by the visitors. Anna is known as the "Deformed Diva". Adam and Doris (Rin and Len) a pair of siamese twins have also been taken in. A nameless werewolf (KAITO) that ran away from home was taken in as well. They all hate the circus, although Doris pretends to like it, while Adam and Anna express their hatred openly.
The third song in the series. It reveals that Anna was married and taken away to the circus, then later commits suicide by cutting off her left arm, which is represented by the blue ice on her limbs.
Note: This song is know as "Red Swamp Bottom" in western fandom, but "On the Bottom of Red Swamp" is more suitable. This tradition comes from SakeBliss's mistranslated title.
The fourth song in the series. After Anna commits suicide, she is sent to hell, which is known as the "Red Swamp". She states that she is in pain, her skin burning to dust, her eyes melted beyond recognition, and her intestines being dragged on the floor. She says that she doesn't want to hear people begging God to let them leave, saying they deserved it for their selfish desires.
The final song in the series. Anna becomes the Grim Reaper to atone for her sins (Suicide) and wields a scythe. At one point, she must judge her husband, and, with tears in her eyes, beheads him.
In the PV, it shows an insane girl being interned in a sanatorium where people are deformed. Machigerita-P later stated on his blog that even though the PV was related to the series, the song itself was not a part of the series.