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Explore endless possibilities in this fantasy series--now with an anime adaptation!In an age when the corners of the world have been scoured for their secrets, only one place remains unexplored--a massive cave system known as the Abyss. Those who traverse its endless pits and labyrinth-like tunnels are known as Cave Raiders. A young orphan named Rico dreams of following in her mother's footsteps as a Cave Raider. When she meets a strange robot when exploring the Abyss, she's one step closer to achieving her goal!