In this postapocalyptic fantasy, a sea of sand swallows everything but the past.

In an endless sea of sand drifts the Mud Whale, a floating island city of clay and magic. In its chambers a small community clings to survival, cut off from its own history by the shadows of the past.

Chakuro, Suou and Shuan ventured the battleship Karcharías, hoping to convince Orca to release Ouni and Lykos. But instead of rescuing their friends, they are now caught up in Orca's plan to destroy the Mud Whale and all its residents in order to unleash an apocalypse that will overthrow the Nouses and create a parallel world where humans will never again feel pain or sadness. When words prove useless against Orca’s sophistry, will the team from the Mud Whale be forced into violence?!