On a mission to annihilate vampires, Momo discovers a music box. The mysterious melody leads to an unlikely encounter with Fine, the vampire queen.

Fine brings Momo to her secluded villa, where they bond over music. Meanwhile, Kubo and Allegro are on a mission to retrieve the two runaways.

Momo wakes up to find herself in a seemingly utopian village where vampires and humans peacefully coexist. She meets Elisha, a vampire her age.

Both the human troops and vampires under Allegro's lead reach the village, forcing Fine and Momo to fight for their lives.