When Laharl demands a place to spend the night in the middle of the desert, he, Flonne, and Etna are guided by the Prinnies to the Netherworld Hall of Treasures. But when Vulcanus causes Flonne and Etna to switch personalities, chaos and hilarity ensue.
Weak without her pendant, Flonne is unable to continue her battle with Laharl. Laharl is soon greeted by his father's old vassal, Etna, and the two leave the poor Angel Trainee to die. Help soon comes in the form of Vyers, the Dark Adonis, but what is his