El laberinto de obsidiana (Runas, 2)

After defeating the Shadow King, Chiri and Dai are settling into their new lives in the magical land of Pastel. However, evil is on their trail. Invited into the Obsidian Labyrinth to battle the sinister Knight of the Night, Chiri and Dai are about to encounter the deepest Darkness that has ever existed, and they aren't sure if they'll both make it back to their friends safely.