Weine is a young vouivre, a dragon girl, who can speak and was attacked by monsters in the dungeon. Bell and the others took her with them to the surface and sheltered her in their Home. What is happening in the dungeon? Are there others like Weine? As some answers cannot be found above ground, Bell and the others enlist Aisha and Ryu's help and head back down to the 19th floor where he first met Weine in the Colossal Tree Labyrinth.