Board Thread:General Discussion/@comment-73.2.245.207-20170222012536/@comment-4698889-20170222060724

I find this theory very plausible. Re_birthday and Clockwork Lullaby were made early on during the series, so I doubt mothy had all the plot threads set up at that point.

I'd also like to point out that the line in Re_birthday mentions the adding of the words "evil" and "water" to the song; those two words are among the words learned by the girl in Wordplay.

There's also the visual parallels. The PVs for Re_birthday and Clockwork Lullaby both have their respective characters making the same pose, except with Rin mirroring Len.

Another thing to note, the Clockwork Lullaby Series doesn't follow chronological order in terms of numbering. For all we know, Wordplay and Clockwork Lullaby could be taking place near the end of the world, since we get the audio cue of Wordplay's tune in Master of the Hellish Yard.