So the master of the heavenly yard pv has come and gone, and while there have been some decent revelations and cool moments, the one thing that still irks me is the fact that mothy never directly addressed "Re_birthday" (Ironic given that part of the song and novel is named Re_birthday Truth)
I have some theories related to the song that I wanted to talk about.
Firstly, who I think the singer is suppossed to represent. I believe that the singer of Re_birthday was originally supposed to be Irregular, a reincarnation of Allen, though now this is not the case, since Irregular is actually Adam's reincarnation, the twin of Eve's reincarnation born from the Master of the Court. I think that at this point, he is supposed to just be Allen
My main reason for believing this is not only the mentioning of Riliane's message, but also the references to the song found in Cloture of Yellow. In the final chapter's prison scenes after Allen is imprisoned while pretending to be Riliane, the song is referenced several times. This parallel between Allen in prison and the singer in the box is purposeful and something not to be ignored. Another set of parallels are in the more recent motheavenly song, in which the song is referenced several times in relation to Allen.
Secondly, what I think Re_birthday is about. I think that instead of representing a single series of events, Re_birthday symbolizes the entirety of Allen's existence.
The first two verses of the song are a reference to Allen's imprisonment during the Lucifenian Revolution, as referenced in Chapter 4, Scenes 1 and 3.
Now the third verse is where I make some more speculations: I think that the Miku voice in the third verse is possibly Luna Hadzuki. I believe that, if Luna is represented by a vocaloid, it could be Miku, as he last name is not only the japanese name for August, Miku's birth month, but also begins with Ha, the first syllable of Miku's surname.
During his time in Sickle's black box, Allen may have somehow managed to speak with Luna. Though what exactly was said is not clear, I think Miku is supposed to represent Luna and her role as a mysterious, omniscient voice who knows of Allen's sins in the song, much like her role as the secret, all-seeing goddess of the Third Period.
The fourth verse is Allen remembering the pain he caused as a human during his time in the black box and understanding how he is not supposed to meet his sister ever again. The fifth verse is a symbolic overview of both his killing of his adoptive father, the red armored soldier, and the sorrow he caused for many other people, including the blue haired king.
The sixth verse refers to the moment before his execution when, from a mysterious source, Allen heard the Clockwork Lullaby sung on the wind (I think by Michaela's spirit but I am not sure on that one). The seventh verse refers to the prison cell once more, as in Cloture, Allen describes hearing what sounds like Michaela's lullaby (heavily implied to be the Clockwork Lullaby) coming from the window in the ceiling of his cell.
The seventh verse is one I am a little iffy on because I feel like it is refferring to the still unclear connection between Allen (Re_birthday's singer) and the singer(s?) of the other two vaguely connected Clockwork Lulllaby songs, Wordplay and Clockwork Lullaby, and mothy's other related song, Full Moon Laboratory. Someone probably has a better theory than me about his verse, but for now I am just going to leave it be.
The eighth verse is referring to the events of master of the heavenly yard, when Allen finally receives Riliane's message in a bottle she cast to sea. It also references Wordplay. The ninth and tenth verses refer to what I believe to be the re_birthday incited by Allen and Riliane, which rebirths the world, creating the Fourth Period. Allen is finally able to be forgiven of his sins, with the shackles of his past falling off of him, and enter the new world.
The final verse refers to this, with Allen saying that as the world fades to white, he knows that he shall meet Rilliane again soon in the new world. Overall, this song describes how Allen goes from a sinner who may never find redemption to finally being able to be forgiven and be reborn anew, not only through the re_birthday of the third period into the fourth period, but also through his own inner re_birthday.
Wooh. That was a lot. Again, this is my theory about the song based on what I know about the series, so I am certain there are things I am wrong about. I just wanted to put it out there to get the rest of you guys' feedback.
Alright, have a good one.