This is a prequel that doesn't need justification for existing. Six adolescent angels on the day they become adults, that's the entire setup, and it's enough because the show knows you're here for the quiet moments between them, the visual feast of it, the understanding that this peace won't last. The art moves like water; every frame is composed to make you want to stay in Heaven a little longer. You're watching a memorial to something beautiful right before it breaks.

Six adolescent angels, Judas, Luca, Goh, Shin, Rey, and Gai, live in a Heaven that is still at peace. On the day of Benediction, Zeus, the highest of the gods, turns them into adults. Each of the six has special abilities of their own, and all of them must grow used to their new grown-up bodies. Along the way, chances to meet one another come up, and fresh friendships take shape. The two-episode fantasy OVA is set long before a rebellion in Heaven sees Judas and Luca, two of these chosen Saint Beasts, thrown out and locked away in Hell, and it looks back at the calm days that came first.