ぜんまい仕掛けの子守唄 (Zenmai Jikake no Komoriuta)

Background
This singing voice is a clockwork lullaby A song about an unnamed girl singing a lullaby to heal others.

The first line of the song is the same as the last line of "Kotoba Asobi" (Word Play) by Akuno-P which was sung also by Rin.

"Zenmai Jikake no Komoriuta" is part of the Clockwork Lullaby series and is featured on the albums Evils Theater and Akujiki Musume Conchita (Kai) by Akuno-P.

This song has entered the Hall of Fame.