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.

Monsters who can speak, who defy all that is known. Bell and the others receive a warm welcome from the Xenos. They are so strikingly different from human peoples in form, but they eat, drink, and have fun just as humans do. Seeing this strange sight, Bell and the others can't conceal their confusion. In the midst of the feast, Bell and the others are told by the leader of the Xenos, the lizardman, Lyd, of the Xenos' connection to the Guild, the particulars behind their current situation, and...their intentions...