"Clockwork Lullaby ZERO"
"Around the time I memorized the word called evil."
The story of a young girl learning various words and about the world through them.
- The PV's illustration was drawn by mothy.
- As the "zeroth" song in the Clockwork Lullaby series, it is the first song to feature part of the lulila motif, and is succeeded by Clockwork Lullaby.
- The first portion of the song exclusively uses hiragana, while the second portion starts incorporating kanji.
- The character featured in the PV appears identical to Kagamine Rin's VOCALOID2 module.