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. 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. her goal.