Specifically "Ave Mundi Spes Maria" (Hail Mary, Hope of the World). 2. Symbolism and Narrative Integration

The melody takes inspiration from several sources, including passages from Bach and various Renaissance hymns. It utilizes a slow, solemn tempo (Andante) and a minor tonality to evoke a sense of sorrow and sacredness.

"Lilium" is Latin for Lily , a flower traditionally symbolizing purity and resurrection. This directly contrasts with the violent, tragic life of Lucy, the series' protagonist.

The song was designed to sound like a contemporary Gregorian hymn . It features a mezzo-soprano solo (performed by Kumiko Noma) followed by male a cappella voices, a structure that mirrors traditional Catholic liturgical music.